katex and highlight
katex and highlight

- update katex
- update highlight.js
- changed server.js html head to optimize for update
- updated libcss bootstrap default color and background for pre code
    - allowing highlight.js styles to handle code blocks
    - changed def color and background for inline code blocks
- external assets recommended for libcss
    - from katex project
        - katex.min.css
        - fonts/
    - from highlight.js project
        - highlight.min.js
        - styles/

ackmanlab/woola