UI Changes

The chat shortcode has been reworked. Rather than appearing as
paragraphs, the UI elements have been sorted into tabs that are hidden
by default and toggled by buttons.

IDs have been added+changed to accomodate this.

Button and input styling have been abstracted slightly. I am considering
moving these styles further out, to my blog CSS.

Chat identity

The chat app now uses digital signatures for identify verification.

A new blog post discusses this implementation and what I've learned
about PGP and digital signature cryptography.

Also, minor typo fixes and adding an aspell recipe.

Adding live chat page