Deprecate falco-exporter

[leogr]

Repository: https://github.com/falcosecurity/falco-exporter

Motivation

Starting from version 0.38, Falco itself can expose Prometheus metrics as an incubating feature. This eliminates the need for a separate exporter to handle metrics exposure.

The proposal is to initiate the deprecation process for falco-exporter now, with the intent to fully archive the repository once the Prometheus metrics feature in Falco is promoted to stable (this may realistically happen around Falco 0.40).

This ensures a streamlined approach to metrics handling and avoids maintaining redundant tools.

cc @falcosecurity/falco-exporter-maintainers @falcosecurity/core-maintainers

Deprecation Tasklist

Tasks

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1. update(README.md): deprecation notice falco-exporter#105
   approved dco-signoff: yes kind/documentation lgtm size/XS +5
   
2. docs(repositories.yaml): falco-exporter deprecation #425
   approved dco-signoff: yes kind/deprecated lgtm size/XS +5
   
3. Add deprecation notice to falco-exporter chart documentation
4. Remove falco-exporter references from falco-website main documentation (we will just keep it in old blogs)

Archiviation Tasklist

Tasks

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1. Archive the falco-exporter repository
2. Remove falco-exporter chart

[leogr]

FYI I've also updated the Prometheus Default port allocations page (diff)👇
https://github.com/prometheus/prometheus/wiki/Default-port-allocations