Header used to add link to all pages of the site, even those which do not have any title, creating empty anchors on the page like `<a class="page-link" href="/feed.xml"></a>`. Those were non click-able and used space on the page due to margins.
Now only displays pages with a title.
- unicode menu icon doesn’t render pixel crisp (has some
anti-aliasing), whereas SVG renders pixel optimized
- using inline SVG (instead of a referenced, attached file, will save
an http request
- use anchor instead of h1 for site title, for semantic accuracy, and
because post h1’s should be the post title
- implement nav wrapper for nav links
- use div.wrap for design structure