* Remove project files from the ignore list
* Add project config files as they are now
* Create a new untracked file to keep track of project directory paths

The reason why I never tracked project files in the repo was because I
didn't want my file paths to be shared publicly. But over time I've been
making changes to my `flashnotes.vim` config and wanted to be able to
track those changes, especially the `ctags` ones.

Now, I'm able to track those config files and still hide my file paths
from public view using a set of environment variables defined in
`.vim/projects/file-paths.vim`.

* Add backup directories using .gitkeep files
* .gitignore:
  - ignore files in the three backup directories
  - ensure that .gitkeep files are not ignored

Only ignore the projects/ dir in the repository root. Who knows? we
might have a projects/ directory somewhere else in here that we want
to hold on to.

.vimrc from today. Will be re-adding my plugins as git submodules.