Refactor Mongoose documentation

PUBLISHED_FROM=e9a4e5c7b4a1d03b93a2a79e29de19e60e919929

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

@@ -0,0 +1,26 @@
+---
+title: "Server API reference"
+symbol_kind: "intro"
+decl_name: "http_server.h"
+items:
+  - { name: mg_parse_http.md }
+  - { name: mg_get_http_header.md }
+  - { name: mg_http_parse_header.md }
+  - { name: mg_parse_multipart.md }
+  - { name: mg_get_http_var.md }
+  - { name: mg_serve_http.md }
+  - { name: mg_http_serve_file.md }
+  - { name: mg_register_http_endpoint.md }
+  - { name: mg_file_upload_handler.md }
+  - { name: mg_http_check_digest_auth.md }
+  - { name: mg_send_http_chunk.md }
+  - { name: mg_printf_http_chunk.md }
+  - { name: mg_send_response_line.md }
+  - { name: mg_send_head.md }
+  - { name: mg_printf_html_escape.md }
+  - { name: mg_fu_fname_fn.md }
+  - { name: struct_mg_serve_http_opts.md }
+---
+
+
+