Migrated the docs configuration towards two column layout and simplified repository link text in docs

Reworded amendment

Hint at the possibility to leave out the final placeholder

Synced release version across docs and packaging config

Grouped similar if branches

Simplified final foreach-or-null occurrence

Nit: Better name for array elements to be flattened

Further simplifications for the population use accumulator

Implemented some simplifications (kudos to Jarek)

Bumped version in packaging config

Started changes section for next release

Added docs nav uplink

Added the usual set of markdown extensions

Patched README and docs landing page to provide the original codeberg blurb from https://docs.codeberg.org/getting-started/what-is-codeberg/

Made README and docs landing page lobby for the distributed in dvcs (git), codeberg, and sourcehut

Removed final traces of github from the docs

Bumped deps and the package version

Prepared release by adding changes (and fixing the links)

Harmonized README

Changed links in configuration files