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/dns.h/mg_dns_insert_header.md

@@ -1,13 +0,0 @@
----
-title: "mg_dns_insert_header()"
-decl_name: "mg_dns_insert_header"
-symbol_kind: "func"
-signature: |
-  int mg_dns_insert_header(struct mbuf *io, size_t pos,
-                           struct mg_dns_message *msg);
----
-
-Insert a DNS header to an IO buffer.
-
-Return number of bytes inserted. 
-