Add structured data markup for `itemprop="person"` in author-profile (#647)

Adds schema.org data for image, name, homeLocation, url, email,
and sameAs (for all the social media links).

Add structured data markup for `itemprop="person"` in author-profile

Adds schema.org data for image, name, homeLocation, url, email,
and sameAs (for all the social media links).

Merge branch 'release/4.0.5' into develop

Bump version to 4.0.05

Update CHANGELOG.md

Replace `base_path` with `absolute_url` filter

Merge branch 'feature/pagination-link-color' into develop

Make pager (next/previous) active state more obvious by adding changing gray color to `$link-color`

Bump `add_runtime_dependency` for gems

Merge branch 'feature/sidebar-flicker-fix' into develop

Fix `.sidebar` flicker/jump when hovered
- Close #583

Move `gh-pages` branch files into `/docs` and add test files
- Jekyll ignore `/docs` and `/test` folders when using from root
- Update Staticman config to point to correct branch and data file location
- Replace `{{ base_path }}` references with `absolute_url` filter
- Update documentation

Update CHANGELOG.md

Merge branch 'release/4.0.4'

Conflicts:
	README.md

Add note about Ruby gem version

Update CHANGELOG.md and bump version to 4.0.4

Merge branch 'feature/theme-gem' into develop

Add `_data` files to root for those forkers of the repo

Added missing Turkish translation for UI text (#621)

Added missing Turkish translation for UI text (#621)