fix: Track svelte dist files and add tests badge to README

The .gitignore had a bare `dist` entry which matched
askbot/media/svelte/dist/, preventing the built svelte JS files
from being tracked. This caused 26 test failures in CI due to
the |media template filter returning None for missing files.

Changed `dist` to `/dist` to only ignore the top-level build
output directory. Also added GitHub Actions test status badge
to README.md.

Author: evgenyfadeev

.gitignore

@@ -50,7 +50,7 @@ askbot/skins/common/media/js/closure/google-closure
 askbot/skins/common/media/js/jquery.fancybox-1.3.4
 askbot/fixtures
 *.egg
-dist
+/dist
 *.egg-info
 build
 askbot/upfiles/

README.md

@@ -1,3 +1,5 @@
+[![Github tests](https://github.com/ASKBOT/askbot-devel/actions/workflows/tests.yml/badge.svg)](https://github.com/ASKBOT/askbot-devel/actions/workflows/tests.yml)
+
 ## Askbot - a Django Q&A forum platform
 
 This is Askbot project - open source Q&A system, like StackOverflow, Yahoo Answers and some others.