Merge branch 'issue-templates' into 'develop'

Add Bug issue template

See merge request soapbox-pub/soapbox-fe!1452

.gitlab/issue_templates/Bug.md

@@ -0,0 +1,7 @@
+### Environment
+
+* Soapbox version:
+* Backend (Mastodon, Pleroma, etc):
+* Browser/OS:
+
+### Bug description