git: reduce gitignore to bare minimum

Ignoring other file types might cause us to forget to set gitignores in
the repository itself since we can't assume everyone ignores those
globally.

.config/git/ignore

@@ -1,53 +1 @@
-# Compiled source #
-###################
-*.class
-*.dll
-*.exe
-*.o
-*.so
-*.pyc
-
-# Packages #
-############
-# it's better to unpack these files and commit the raw source
-# git has its own built in compression methods
-*.7z
-*.dmg
-*.gz
-*.iso
-*.rar
-*.tar
-*.zip
-
-# Logs and databases #
-######################
-*.log
-*.sqlite
-
-# OS generated files #
-######################
 .DS_Store
-.DS_Store?
-._*
-.Spotlight-V100
-.Trashes
-Icon?
-ehthumbs.db
-Thumbs.db
-.sass-cache
-
-# Project files #
-#################
-/*.sublime-workspace
-/.idea
-
-# Build scripts #
-#################
-/build.sh
-/run.sh
-
-# Swap files #
-##############
-*.sw?
-project.vim
-*.rest