Remove mg_http_run_simple_server - move to docs

src/http.h

@@ -63,4 +63,3 @@ void mg_http_bauth(struct mg_connection *, const char *user, const char *pass);
 struct mg_str mg_http_get_header_var(struct mg_str s, struct mg_str v);
 size_t mg_http_next_multipart(struct mg_str, size_t, struct mg_http_part *);
 int mg_http_status(const struct mg_http_message *hm);
-void mg_http_run_simple_server(const char *url);