Simplify our gitignore files (#2925)

libs/components/.gitignore

@@ -1,44 +1,7 @@
 # See http://help.github.com/ignore-files/ for more about ignoring files.
 
-# Compiled output
-/dist
-/tmp
-/out-tsc
-/bazel-out
-
-documentation.json
-
-# Node
-/node_modules
-npm-debug.log
-yarn-error.log
-
-# IDEs and editors
-.idea/
-.project
-.classpath
-.c9/
-*.launch
-.settings/
-*.sublime-workspace
-
-# Visual Studio Code
-.vscode/*
-!.vscode/settings.json
-!.vscode/tasks.json
-!.vscode/launch.json
-!.vscode/extensions.json
-.history/*
-
 # Miscellaneous
 /.angular/cache
 .sass-cache/
 /connect.lock
-/coverage
-/libpeerconnection.log
-testem.log
 /typings
-
-# System files
-.DS_Store
-Thumbs.db