Add theme hugo-texify3

[michaelneuper]

Forked from TeXify2 and added the following:

• Change homepage to display an _index.md with a sidebar listing taxonomies
• Add various QOL changes including:
  • Various hover animations
  • A copy button to all code blocks
• Add dark mode toggle
• Add date to posts
• Change to gruvbox color scheme
• Change various other styles such as padding, margins, etc.
• Add pages for different tags and categories
• Add icons
• Display search bar in posts list
• Host various scripts such as KaTeX locally
• Process css through SASS and PostCSS
• Add documentation to GitHub wiki on how to use/change unique features

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