Add README, hide how-to-doc

[abefernan]

• Adds README.
• Hides the "How to doc" section when not inside it.
• Adds keyboard shortcut for accesing it.
• Fixes rendering TagDots on sidebar directories instead of just files.

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Name	Status	Preview	Comments	Updated (UTC)
cosmwasm-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 25, 2024 4:06pm