Switch to Github Actions for building and Github Pages for hosting

[aljungberg]

I have created a github action which builds the site and deploys it to our existing (unused) Github Pages hosting:

https://cappuccino.github.io

Something about the generation of our tag cloud has changed so now tags appear in a different order. The tag cloud wasn't great to begin with though (not sorted by anything, the tag "cappuccino" appearing twice, once with a capital C, etc) so I feel like this might not matter.

Anyhow feedback welcome. Let me know if you see anything that's substantially different between the two sites:

https://www.cappuccino.dev
https://cappuccino.github.io

If there is we will need to fix that before switching cappuccino.dev to point to the new hosting.

We also need to figure out how to deal with old redirects like these:

rewrite ^/2010/04/cappuccino-0-8-tools/?$ http://$host/blog/2010/04/cappuccino-0-8-tools.html permanent;
rewrite ^/2011/05/cappcon-tickets-now-available/?$ http://$host/blog/2011/05/cappcon-tickets-now-available.html permanent;
rewrite ^/2012/04/cappuccino-news-2/?$ http://$host/blog/2012/04/cappuccino-news-2.html permanent;

Maybe replace them with HTML files and meta redirect headers?

[aljungberg]

Fixed:

• duplicate tags (de77c35)
• pygments with objj fork not working when building the site locally (7a459be)

[aljungberg]

Fixed:

• no longer building due to auto-upgrade to ubuntu 22.04 (we need Python 2.7 still) (98a11e9).
• also silenced a bucket of build warnings that were irrelevant.