docs: add dedicated installation page

[davd-gzl]

Centralize install instructions into docs/builders/installation.md with sections for the one-line binary installer, building from source, and Docker. Replace inline install blocks in local-dev-with-gnodev.md and interact-with-gnokey.md with links to the new page.

Related #5460: #5519 (comment)

Depends on: #5492

[Gno2D2]

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[davd-gzl]

Depends on #5492

[codecov]

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