Add RSS/Atom support to the blog page

[pvorisek25]

I think it would be helpful to some people to get blog updates via RSS/Atom rather than having to check the Discord server.

[sr229]

Nice idea! I do get some people who wants to automatically follow news through our website, and scraping is a little too intensive too.

[sr229]

Assigned as a Hacktoberfest issue, good luck hacktoberfest hunters!