The purpose of docs/CHANGELOG.md is to provide VictoriaMetrics users clear and concise information
on what's changed at VictoriaMetrics components. Technical details of the change are unclear
to most of VictoriaMetrics users, who are not familiar with VictoriaMetrics source code.
These details complicate reading the docs/CHANGELOG.md by ordinary users, so do not clutter
the changelog with technical details. If the user wants technical details, he can click
the link to the related GitHub issue and/or pull request and dive into all the details he wants.
It is better from visibility PoV if the CONTRIBUTING.md file is visible at https://docs.victoriametrics.com/contributing/ .
This page can be indexed by search engines and searched by our users later.
It is also easier to provide a link to this page now comparing to the old link, which is much harder to remember:
https://github.com/VictoriaMetrics/VictoriaMetrics/blob/master/CONTRIBUTING.md
While at it, syncrhonize docs/CONTRIBUTING.md with .github/PULL_REQUEST_TEMPLATE/pull_request_template.md ,
so they do not contain duplicate information, which can be outdated over time. Now all the relevant information
is located at docs/CONTRIBUTING.md, while .github/PULL_REQUEST_TEMPLATE/pull_request_template.md refers this doc.
This is a follow-up for c006db1798
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/pull/6040
