symbols: remove .ctags.d

Created by: keegancsmith

In my previous symbols change I didn't properly test runnings ctags with it finding the ".ctags.d". With both it leads to flags being defined twice. Instead we need to remove including .ctags.d in both our development environment and in the containers we build.

This commit removes .ctags.d from all places it is mentioned. Instead we move the files into a directory "ctags.d" that universal-ctags won't look at. Note: https://github.com/sourcegraph/sourcegraph/pull/14037 manually specified the flags that are in ctags.d, so we won't regress on symbol finding for the additional languages.