Theme Check requirements

[jaymcp]

Fixes #21, #24

Proposed Changes

This PR implements several fixes, tweaks, and features to resolve the majority of issues reported by the Theme Check plugin for compatibility with WP.org themes.

Fixes

• Screenshot is now at the recommended dimensions
• An unused variable has been removed
• Theme URI in style.css has been corrected
• Tags have been added to style.css
• Invalid i18n textdomain has been corrected x1
• An unused function has been removed

Tweaks

• Theme options are now in the recommended Appearance menu
• <title> tag output is now handled by WP
  • to disable blogname appending to title, return false in filter benenson_append_blogname_to_wp_title
• Favicons now handled by WP's Site Icon setting in Customizer
• Asset paths/URIs (& associated build tasks) have been moved to the theme root dir
• Several required CSS classes have been declared

Features

• Support for comments (behind a new filter: benenson_comments_enabled)
• Support for display of article author on single (behind a new filter: benenson_display_author)
• Basic support for paginated posts/pages
• Basic support for tags
  • tags will now render on single, if added
    • tag class name can be modified using a new filter: benenson_post_tag_classname

[ampersarnie]

This is awesome, loads of needed changes here, should put us on perfect footing to focus on features, etc. Nice work.

[scottblackburn]

Great work on this @jonmcp