Remove old docs, rename docs_new to docs

It would be probably good idea to also remove tools/docgen.py and
asciidoc.mk, but asciidoc.mk is still mentioned under `cloud/doc`, which
may contain some useful info which we'll need at least to review before
removing.

PUBLISHED_FROM=faf454d4c52a2f07ea8ac084cf0bd11a0c9c9b3b

docs/c-api/json-rpc.h/intro.md

@@ -0,0 +1,8 @@
+---
+title: "JSON-RPC"
+symbol_kind: "intro"
+decl_name: "json-rpc.h"
+---
+
+
+

docs/c-api/json-rpc.h/items.json

@@ -0,0 +1,44 @@
+{
+    "items": [
+        {
+            "type": "markdown",
+            "name": "intro.md"
+        },
+        {
+            "type": "markdown",
+            "name": "mg_rpc_parse_reply.md"
+        },
+        {
+            "type": "markdown",
+            "name": "mg_rpc_create_request.md"
+        },
+        {
+            "type": "markdown",
+            "name": "mg_rpc_create_reply.md"
+        },
+        {
+            "type": "markdown",
+            "name": "mg_rpc_create_error.md"
+        },
+        {
+            "type": "markdown",
+            "name": "mg_rpc_create_std_error.md"
+        },
+        {
+            "type": "markdown",
+            "name": "mg_rpc_dispatch.md"
+        },
+        {
+            "type": "markdown",
+            "name": "struct_mg_rpc_request.md"
+        },
+        {
+            "type": "markdown",
+            "name": "struct_mg_rpc_reply.md"
+        },
+        {
+            "type": "markdown",
+            "name": "struct_mg_rpc_error.md"
+        }
+    ]
+}

docs/c-api/json-rpc.h/mg_rpc_create_error.md

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+---
+title: "mg_rpc_create_error()"
+decl_name: "mg_rpc_create_error"
+symbol_kind: "func"
+signature: |
+  int mg_rpc_create_error(char *buf, int len, struct mg_rpc_request *req,
+                          int code, const char *message, const char *fmt, ...);
+---
+
+Create JSON-RPC error reply in a given buffer.
+
+Return length of the error, which
+can be larger then `len` that indicates an overflow.
+`fmt` format string should conform to `json_emit()` API,
+see https://github.com/cesanta/frozen 
+

docs/c-api/json-rpc.h/mg_rpc_create_reply.md

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+---
+title: "mg_rpc_create_reply()"
+decl_name: "mg_rpc_create_reply"
+symbol_kind: "func"
+signature: |
+  int mg_rpc_create_reply(char *buf, int len, const struct mg_rpc_request *req,
+                          const char *result_fmt, ...);
+---
+
+Create JSON-RPC reply in a given buffer.
+
+Return length of the reply, which
+can be larger then `len` that indicates an overflow.
+`result_fmt` format string should conform to `json_emit()` API,
+see https://github.com/cesanta/frozen 
+

docs/c-api/json-rpc.h/mg_rpc_create_request.md

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+---
+title: "mg_rpc_create_request()"
+decl_name: "mg_rpc_create_request"
+symbol_kind: "func"
+signature: |
+  int mg_rpc_create_request(char *buf, int len, const char *method,
+                            const char *id, const char *params_fmt, ...);
+---
+
+Create JSON-RPC request in a given buffer.
+
+Return length of the request, which
+can be larger then `len` that indicates an overflow.
+`params_fmt` format string should conform to `json_emit()` API,
+see https://github.com/cesanta/frozen 
+

docs/c-api/json-rpc.h/mg_rpc_create_std_error.md

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+---
+title: "mg_rpc_create_std_error()"
+decl_name: "mg_rpc_create_std_error"
+symbol_kind: "func"
+signature: |
+  int mg_rpc_create_std_error(char *buf, int len, struct mg_rpc_request *req,
+                              int code);
+---
+
+Create JSON-RPC error in a given buffer.
+
+Return length of the error, which
+can be larger then `len` that indicates an overflow. See
+JSON_RPC_*_ERROR definitions for standard error values:
+
+- `#define JSON_RPC_PARSE_ERROR (-32700)`
+- `#define JSON_RPC_INVALID_REQUEST_ERROR (-32600)`
+- `#define JSON_RPC_METHOD_NOT_FOUND_ERROR (-32601)`
+- `#define JSON_RPC_INVALID_PARAMS_ERROR (-32602)`
+- `#define JSON_RPC_INTERNAL_ERROR (-32603)`
+- `#define JSON_RPC_SERVER_ERROR (-32000)` 
+

docs/c-api/json-rpc.h/mg_rpc_dispatch.md

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+---
+title: "mg_rpc_dispatch()"
+decl_name: "mg_rpc_dispatch"
+symbol_kind: "func"
+signature: |
+  int mg_rpc_dispatch(const char *buf, int, char *dst, int dst_len,
+                      const char **methods, mg_rpc_handler_t *handlers);
+---
+
+Dispatches a JSON-RPC request.
+
+Parses JSON-RPC request contained in `buf`, `len`.
+Then, dispatches the request to the correct handler method.
+Valid method names should be specified in NULL
+terminated array `methods`, and corresponding handlers in `handlers`.
+Result is put in `dst`, `dst_len`. Return: length of the result, which
+can be larger then `dst_len` that indicates an overflow.
+Overflown bytes are not written to the buffer.
+If method is not found, an error is automatically generated. 
+

docs/c-api/json-rpc.h/mg_rpc_parse_reply.md

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+---
+title: "mg_rpc_parse_reply()"
+decl_name: "mg_rpc_parse_reply"
+symbol_kind: "func"
+signature: |
+  int mg_rpc_parse_reply(const char *buf, int len, struct json_token *toks,
+                         int max_toks, struct mg_rpc_reply *,
+                         struct mg_rpc_error *);
+---
+
+Parse JSON-RPC reply contained in `buf`, `len` into JSON tokens array
+`toks`, `max_toks`. If buffer contains valid reply, `reply` structure is
+populated. The result of RPC call is located in `reply.result`. On error,
+`error` structure is populated. Returns: the result of calling
+`parse_json(buf, len, toks, max_toks)`:
+
+On success, an offset inside `json_string` is returned
+where parsing has finished. On failure, a negative number is
+returned, one of:
+
+- `#define JSON_STRING_INVALID           -1`
+- `#define JSON_STRING_INCOMPLETE        -2`
+- `#define JSON_TOKEN_ARRAY_TOO_SMALL    -3` 
+

docs/c-api/json-rpc.h/struct_mg_rpc_error.md

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+---
+title: "struct mg_rpc_error"
+decl_name: "struct mg_rpc_error"
+symbol_kind: "struct"
+signature: |
+  struct mg_rpc_error {
+    struct json_token *message;       /* Whole RPC message */
+    struct json_token *id;            /* Message ID */
+    struct json_token *error_code;    /* error.code */
+    struct json_token *error_message; /* error.message */
+    struct json_token *error_data;    /* error.data, can be NULL */
+  };
+---
+
+JSON-RPC error 
+

docs/c-api/json-rpc.h/struct_mg_rpc_reply.md

@@ -0,0 +1,14 @@
+---
+title: "struct mg_rpc_reply"
+decl_name: "struct mg_rpc_reply"
+symbol_kind: "struct"
+signature: |
+  struct mg_rpc_reply {
+    struct json_token *message; /* Whole RPC message */
+    struct json_token *id;      /* Message ID */
+    struct json_token *result;  /* Remote call result */
+  };
+---
+
+JSON-RPC response 
+

docs/c-api/json-rpc.h/struct_mg_rpc_request.md

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+---
+title: "struct mg_rpc_request"
+decl_name: "struct mg_rpc_request"
+symbol_kind: "struct"
+signature: |
+  struct mg_rpc_request {
+    struct json_token *message; /* Whole RPC message */
+    struct json_token *id;      /* Message ID */
+    struct json_token *method;  /* Method name */
+    struct json_token *params;  /* Method params */
+  };
+---
+
+JSON-RPC request 
+