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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[alexiscolin]

LGTM cc @aeddi / @sw360cab for the ops confirmation

[sw360cab]

LGTM

[davd-gzl]

Should add troubleshooting + remove TODO, blocker until added
Edit: fixed in: 3069021, 6fe9d16

[aeddi]

Let's wait for #5492 to be merged so the codegen-verify/docs workflow can do its job.

[davd-gzl]

I've changed the install directory according to #5492 (comment) @alexiscolin
This should be merged before #5553