Fix title-pattern/prefix problem

When a `prefix` was specified, the `title-pattern` was erroneously
applied to the _prefixed_ title, which has been fixed.

Also: Dependency updates.

Update dependencies

Add `url-only` option, and do close HTTPS connections

Update a couple of dependencies

Fix breakage caused by the GitHub REST API upgrade

A couple of dependencies were updated.

This Action now uses node.js 20

This Action now uses the current `html-to-md`

This Action now uses node.js v16 and html-to-md

v0.0.3

This GitHub Action now handles feeds with title-less items gracefully.
Such feeds include the ones generated from GitHub's wikis.