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_var.md

@@ -1,16 +0,0 @@
----
-title: "mg_get_http_var()"
-decl_name: "mg_get_http_var"
-symbol_kind: "func"
-signature: |
-  int mg_get_http_var(const struct mg_str *buf, const char *name, char *dst,
-                      size_t dst_len);
----
-
-Fetch an HTTP form variable.
-
-Fetch a variable `name` from a `buf` into a buffer specified by
-`dst`, `dst_len`. Destination is always zero-terminated. Return length
-of a fetched variable. If not found, 0 is returned. `buf` must be
-valid url-encoded buffer. If destination is too small, `-1` is returned. 
-