docs(README.md): archiving unmaintained repositories

[leogr]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind documentation

/kind feature

/kind sandbox

/kind incubating

/kind officialsupport

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area deploy

/area examples

/area integrations

/area proposals

What this PR does / why we need it:

See:

• https://github.com/falcosecurity/evolution/issues/161
• https://github.com/falcosecurity/evolution/issues/162
• https://github.com/falcosecurity/evolution/issues/164

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[leogr]

/check-dco

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: leogr, maxgio92

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/falcosecurity/evolution/blob/master/OWNERS)~~ [leogr,maxgio92] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment