Indicate bundled dependencies and their licenses

[bkmgit]

The following are bundled in the lib folder:

• BreezeStyleSheets
• cmark
• gumbo-parser
• luis-l-gist

Would be good to indicate this in the README, possibly adding links to the original sources where possible

• https://github.com/Alexhuszagh/BreezeStyleSheets
• https://github.com/commonmark/cmark
• https://github.com/google/gumbo-parser - archived and unmaintained, a possible replacement is https://github.com/lexbor/lexbor
• https://gist.github.com/luis-l/5c78488906dc98ce9316 no license information

Can make a pull request with these additions.

[ikskuh]

Sure do so! I always oversight such things