.gitignore: strip down to the repo-specific suppressions

Maintaining a list of all the temp files used by various editors and
IDEs is cumbersome. Instead of doing that in each repo, developers
contributing to kubernetes-csi should set up a global .gitignore for
their own tools.

.gitignore

@@ -1,46 +1,2 @@
 # Compiled binaries and deployment files
 /bin/
-/deploy/docker/csi-snapshotter
-
-# Binaries for programs and plugins
-*.exe
-*.exe~
-*.dll
-*.so
-*.dylib
-
-# Test binary, build with `go test -c`
-*.test
-
-# Output of the go coverage tool, specifically when used with LiteIDE
-*.out
-
-# OSX leaves these everywhere on SMB shares
-._*
-
-# OSX trash
-.DS_Store
-
-# Eclipse files
-.classpath
-.project
-.settings/**
-
-# Files generated by JetBrains IDEs, e.g. IntelliJ IDEA
-.idea/
-*.iml
-
-# Vscode files
-.vscode
-
-# Emacs save files
-*~
-\#*\#
-.\#*
-
-# Vim-related files
-[._]*.s[a-w][a-z]
-[._]s[a-w][a-z]
-*.un~
-Session.vim
-.netrwhist