Docs update and refactor

[AleoAlexander]

Content Changes

• CLI directory now contains exclusively documentation, with each command getting it's own page, and any subcommands being listed within that page.
• The previous set of pages in the Testing directory have been rewritten and consolidate into a single Testing guide
• Various typo corrections and broken link fixes

Structure Changes:

• The tutorials previously in CLI have been moved to Guides
• All pages previously in Recipes, Testing, or Guides have been consolidated into a single Guides directory
• Moved the create-leo-app tutorial into the Resources directory. Previously, it was in the SDK directory, which was removed from the site, but the example was still on the "What's New?" page
• All unused folders and docs have been moved into a dedicated deprecated/ directory.

TODOs:

• Need to work with @d0cd to figure out what needs to be rendered on the in-page sidebar for the new pages

Future Work

• Certain flags for leo build, leo run, leo deploy, and leo execute have not been documented due to ambiguity. They are currently listed in the docs exactly as they appear in the CLI output
• The guide for Querying the Network was left unchanged, currently it just says "Coming Soon!"

Closes #494, #496, #498, #500, #502, #507, and #508

[WaltzOfWhispers]

First round of review. I would highly suggest sending out separate PRs to close different issues going forward. 3k+ LOC makes it hard to review and catch errors. Additionally, it's easier to track whether the issues have actually been addressed when there are fewer of them.

[WaltzOfWhispers]

Thanks for the refactor!

[WaltzOfWhispers]

blocking comment for someone from Provable to check how these changes show up

[WaltzOfWhispers]

LGTM pending the last comment. thank you!