The site now has polygot markup and can handle both XHTML5 and HTML5
parsing rules. My staging site will be XHTML but my main site will be
HTML5, just in case of parse errors.
If other tools (e.g. LightHouse) end up supporting XHTML5, I'll consider
switching the content-type to XHTML.
Add an RSS feed for notes. Next up, replacing the RSS navlink with a
page containing links to both my posts and notes RSS feeds. When I get
ATOM and WebSub, it'll have links ot those too.
Also fixed some typos and switched "Posted" to "Noted" in the context of
notes.
