Refactor Mongoose documentation

PUBLISHED_FROM=e9a4e5c7b4a1d03b93a2a79e29de19e60e919929

docs/c-api/http_client.h/intro.md

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+---
+title: "Client API reference"
+symbol_kind: "intro"
+decl_name: "http_client.h"
+items:
+  - { name: mg_connect_http.md }
+  - { name: mg_connect_http_opt.md }
+  - { name: mg_http_create_digest_auth_header.md }
+---
+
+
+

docs/c-api/http_client.h/mg_connect_http.md

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+---
+title: "mg_connect_http()"
+decl_name: "mg_connect_http"
+symbol_kind: "func"
+signature: |
+  struct mg_connection *mg_connect_http(struct mg_mgr *mgr,
+                                        mg_event_handler_t event_handler,
+                                        const char *url,
+                                        const char *extra_headers,
+                                        const char *post_data);
+---
+
+Helper function that creates an outbound HTTP connection.
+
+`url` is the URL to fetch. It must be properly URL-encoded, e.g. have
+no spaces, etc. By default, `mg_connect_http()` sends the Connection and
+Host headers. `extra_headers` is an extra HTTP header to send, e.g.
+`"User-Agent: my-app\r\n"`.
+If `post_data` is NULL, then a GET request is created. Otherwise, a POST
+request is created with the specified POST data. Note that if the data being
+posted is a form submission, the `Content-Type` header should be set
+accordingly (see example below).
+
+Examples:
+
+```c
+  nc1 = mg_connect_http(mgr, ev_handler_1, "http://www.google.com", NULL,
+                        NULL);
+  nc2 = mg_connect_http(mgr, ev_handler_1, "https://github.com", NULL, NULL);
+  nc3 = mg_connect_http(
+      mgr, ev_handler_1, "my_server:8000/form_submit/",
+      "Content-Type: application/x-www-form-urlencoded\r\n",
+      "var_1=value_1&var_2=value_2");
+``` 
+

docs/c-api/http_client.h/mg_connect_http_opt.md

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+---
+title: "mg_connect_http_opt()"
+decl_name: "mg_connect_http_opt"
+symbol_kind: "func"
+signature: |
+  struct mg_connection *mg_connect_http_opt(struct mg_mgr *mgr,
+                                            mg_event_handler_t ev_handler,
+                                            struct mg_connect_opts opts,
+                                            const char *url,
+                                            const char *extra_headers,
+                                            const char *post_data);
+---
+
+Helper function that creates an outbound HTTP connection.
+
+Mostly identical to mg_connect_http, but allows you to provide extra
+*parameters
+(for example, SSL parameters) 
+

docs/c-api/http_client.h/mg_http_create_digest_auth_header.md

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+---
+title: "mg_http_create_digest_auth_header()"
+decl_name: "mg_http_create_digest_auth_header"
+symbol_kind: "func"
+signature: |
+  int mg_http_create_digest_auth_header(char *buf, size_t buf_len,
+                                        const char *method, const char *uri,
+                                        const char *auth_domain, const char *user,
+                                        const char *passwd);
+---
+
+Creates digest authentication header for a client request. 
+