docs: resolve documentation TODOs and add missing badges

[Copilot]

Addressed three documentation TODOs that were blocking self-sufficiency and completeness.

Changes

• README.md: Added codecov badge for examples section following existing pattern
• gnovm/cmd/gno/README.md: Replaced empty TODO with quick-start examples and documentation links
• gno.land/cmd/gnoland/README.md: Removed external blog dependency, added comprehensive setup guide covering development mode, production mode, and configuration management

All changes are documentation-only. The gnoland README is now self-sufficient without requiring external resources.

Original prompt

Checkout my inactive repos with a lot of stars and suggest low hanging fruit maintenance things

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[moul]

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[Gno2D2]

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