Added: Comment support

The blog has officially been given comment support. While the articles themselves are markdown files in the repository and are pre-rendered to json during the build process, the comments are stored in a database. Authentication is provided by GitHub OAuth.

For the time being, I'm going to have it so that I need to approve comments when they are posted. Hopefully with the GitHub OAuth requirement there won't be too much spam. Guess we shall find out - that was the reason I removed comment support in the first place.

Unfortunately, I no longer have the comments from older vimtips.org articles. Not sure what happened to them. I guess when I turned them off I forgot to back them up. Oh well 😉