* add canonical_url block to base.html, change canonical url for pages
* Avoid nesting block within block
That leads to repeating the block twice instead of replacing its value
from `base.html`
* added trailing slash to Home link - to properly handle root urls
* updated Home link on author page
* updated Home link on misc. pages
* switched from capitalize to title in order to properly capitalize two word names
* reverted URL changes to keep seperate from casing logic changes
* updated metatag logic to remove extraneous metatags on articles
* removed other changes. only author casing in this PR
