Add basic gitignore file
Add opening config files in correct vim file-types
Exclude vim file artifacts
Fix dark theme against changes in tmux v2.9
Fix typos
Improve plugin installer
Update README
Update changes to gruvbox dark theme
Update config and remove deprecated/outdated configuration
Update tmux-gruvbox-dark.conf
* Rename to have .tmux extension so TPM can pick it up
* Create a separate file for TPM & source the theme file
* Update readme with instructions for installation through TPM
