Mention TiddlyHost and link to some documentation on the
configuration options.
Also remove the TiddlySpot control panel and backups links since
they no longer work.
Notes:
* The last three fields are no use for TiddlySpot or TiddlyHost, but
it's possible that someone, somewhere is still using the old
store.php from Bidix's UploadPlugin, and would miss them if they
were removed.
I'd be happy to remove them in a future PR, if it's decided they
can be retired.
(If they were removed, I could delete the last row here:)
https://github.com/simonbaird/tiddlyhost/wiki/TiddlySpot-Saver-configuration-for-Tiddlyhost-and-Tiddlyspot
* It's still called "TiddlySpot Saver" which I think is fine for
now. TiddlyHost might use a different saving method in future
so keeping the existing name seems best.
