Improve structure of community guides

[jlwllmr]

Fixes #614:

• Moves Irys pages to their own directory
• Adds index page for Irys directory
• Fixes any necessary links
• Amends sidebar accordingly
• Other minor edits to copy and titles.

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Name	Status	Preview	Comments	Updated (UTC)
doc-zk-evm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 28, 2024 10:34am