Hash/Key Type Documentation Revamp

[ACStone-MTS]

What does this PR fix/introduce?

The Hash Types document grew beyond the original formatting as more key types were added. This PR restructures the document and updates it to include new 2.0 types.

Checklist

(Delete any that aren't relevant)

• [x] Docs are successfully building - yarn install && yarn run build.
• [x] For new internal links I used relative file paths (with .md extension) - e.g. ../../faq/faq-general.md - instead of introducing absolute file path, or relative/absolute URL.
• [x] All external links have been verified with yarn run check:externals.
• [x] My changes follow the Casper docs style guidelines.
• [x] If structural changes are introduced (not just content changes), cross-broswer testing has been completed.

Reviewers

@ipopescu