Temporarily disable appdash from docker-compose

Until I read the doc and find how to limit the retention,
otherwise it just eats all my ram and cpu and things start to fall
apart.

PUBLISHED_FROM=eb33fb44736f07b992270689217aca4af70513ff

docs/c-api/http.h/mg_get_http_header.md

@@ -1,13 +0,0 @@
----
-title: "mg_get_http_header()"
-decl_name: "mg_get_http_header"
-symbol_kind: "func"
-signature: |
-  struct mg_str *mg_get_http_header(struct http_message *hm, const char *name);
----
-
-Search and return header `name` in parsed HTTP message `hm`.
-If header is not found, NULL is returned. Example:
-
-    struct mg_str *host_hdr = mg_get_http_header(hm, "Host"); 
-