feat: Add CODEOWNERS

[Kouteki]

Current state

• No code owners for docs.gno.land - open PRs aren't automatically assigning reviewers

Desired state

• Tech staff team are code owners. Open PRs automatically assign reviewers

AC

• Add @gnolang/tech-staff as docs.gno.land code owners

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[alexiscolin]

@Kouteki @leohhhn @zivkovicmilos Do you think we can add me as co-owner for /docusaurus folder? So, I would be pinged for any update that can occur in this folder that I usually maintain.

[leohhhn]

Please also add @gnolang/devrels to codeowners

[zivkovicmilos]

Please also add @gnolang/devrels to codeowners

@leohhhn

We don't believe the DevRel team should be a CODEOWNER for the core team documentation, hence this PR that doesn't include the DevRel team. Core team documentation should stay within the core team, and be managed by the core team, while the DevRel team can advise

[Kouteki]

@alexiscolin added you as the code owner, and also as the PR reviewer :)

[alexiscolin]

Thank you 🙏