chore: update deadlinks

[MikaelVallenet]

This PR fixes broken and outdated links throughout the codebase:

• Fix typo in CONTRIBUTING.md: Missing closing parenthesis in Awesome Gno link
• Update Makefile commands in READMEs: install_gnokey → install.gnokey, install_gno → install.gno
• Fix tx-archive path: Updated to gnolang/gno/tree/master/contribs/tx-archive
• Fix Tendermint links: Updated tendermint/classic references to tendermint/tendermint throughout tm2/
• Update documentation URLs: Migrated from deprecated tendermint.com/docs/ to docs.tendermint.com/ and docs.cometbft.com/
• Fix GitHub path formats: Corrected malformed paths like gnolang/gno/tm2/pkg/bft/ to proper gnolang/gno/tree/master/tm2/pkg/bft/ format
• Fix external references: Updated cosmos-sdk, iavl, and tmlibs links to correct repositories
• Remove dead references: Removed broken links to non-existent files (e.g., zrealm_nft3.gno, outdated ABCI docs)

[Gno2D2]

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✅ All modified and coverable lines are covered by tests.

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[Davphla]

I re verified all the links and they all working great. I didn't re verify if there's missing broken links.