Docs updates
Fix @giffmex's themes

They just needed the `tw-body` class added to the body element.
Update the deploy script to publish to NPM

Which means that I'll only be deploying when there's a version bump.
Which means that I'll be deploying new versions multiple times a day
sometimes.
Script for bumping the version number
Fix problem with edit-text widget and indexed properties

Thanks to @grayeul for the pointer:

https://github.com/Jermolene/TiddlyWiki5/commit/78bc89cbdbcc26e373001f2d
473436489d8d4365#commitcomment-4554613