Adds rendering of headings as links

Video background awesomeness

The awesome victoriadrake#90 adds an optional video background to your main page. The
theme also now features an upgraded gallery! Thanks in very large part
to this theme's awesome contributors, particularly @arthurbailao.

Accessibility improvements

This breaking change release addresses this issue by using HTML content sectioning and common role attributes.

Changes of note:

- Conversion of many nested <div> elements to proper content sectioning elements such as <main> and <nav>
- Sass styling formerly applied to #content is now applied to <article>; id="content" has been removed from templates
- Renaming of the section class in style.sass to the more accurate flex-container

Merge pull request victoriadrake#52 from victoriadotdev/update-gallery

Update gallery template (fix victoriadrake#46, close victoriadrake#35)

This release adds:

- Hugo Pipes
- Internal templates
- Multiple galleries from any-name subfolders

Template cleanup and update

Use Hugo base templates

DRY bottom menu code

Bug fixes and style updates

Fixed bug in sass