ci: remove microsoft-prod.list

This is added by default, and it is often broken, but we don't need
anything from it.

Closes #13473

DISTROS: add document with distro pointers

Lots of organizations distribute curl packages to end users. This is a
collection of pointers to where to learn more about curl on and with

DISTROS: add document with distro pointers

Lots of organizations distribute curl packages to end users. This is a
collection of pointers to where to learn more about curl on and with
each distro.

Assisted-by: Alan Coopersmith
Assisted-by: Andrew Kaster
Assisted-by: Andy Fiddaman
Assisted-by: Arjan van de Ven
Assisted-by: Brian Clemens
Assisted-by: chrysos349 on github
Assisted-by: Dan Fandrich
Assisted-by: Dan McDonald
Assisted-by: Gaelan Steele
Assisted-by: graywolf on github
Assisted-by: Jan Macku
Assisted-by: John Marshall
Assisted-by: Jonathan Perkin
Assisted-by: Kevin Daudt
Assisted-by: Marcus Müller
Assisted-by: Michał Górny
Assisted-by: Outvi V
Assisted-by: Ross Burton
Assisted-by: Sean Molenaar
Assisted-by: Till Wegmüller
Assisted-by: Viktor Szakats
Assisted-by: Winni Neessen

Closes #13178

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docs: introduce "curldown" for libcurl man page format

curldown is this new file format for libcurl man pages. It is markdown
inspired with differences:

- Each file has a set of

docs: introduce "curldown" for libcurl man page format

curldown is this new file format for libcurl man pages. It is markdown
inspired with differences:

- Each file has a set of leading headers with meta-data
- Supports a small subset of markdown
- Uses .md file extensions for editors/IDE/GitHub to treat them nicely
- Generates man pages very similar to the previous ones
- Generates man pages that still convert nicely to HTML on the website
- Detects and highlights mentions of curl symbols automatically (when
their man page section is specified)

tools:

- cd2nroff: converts from curldown to nroff man page
- nroff2cd: convert an (old) nroff man page to curldown
- cdall: convert many nroff pages to curldown versions
- cd2cd: verifies and updates a curldown to latest curldown

This setup generates .3 versions of all the curldown versions at build time.

CI:

Since the documentation is now technically markdown in the eyes of many
things, the CI runs many more tests and checks on this documentation,
including proselint, link checkers and tests that make sure we capitalize the
first letter after a period...

Closes #12730

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tidy-up: fix yamllint whitespace issues

Closes #12466

gha: bump actions to latest versions

- actions@checkout@v4 (from v3 and v2)

- fsfe/reuse-action@v2 (from v1)

Closes #12000

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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GHA: clarify workflows permissions, set least possible privilege

Set top-level permissions to None on all workflows, setting per-job
permissions. This avoids that new jobs inherit unwant

GHA: clarify workflows permissions, set least possible privilege

Set top-level permissions to None on all workflows, setting per-job
permissions. This avoids that new jobs inherit unwanted permissions.

Discussion: https://curl.se/mail/lib-2022-11/0028.html

Signed-off-by: Diogo Teles Sant'Anna <diogoteles@google.com>

Closes #9928

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CI/GHA: cancel outdated CI runs on new PR changes

Avoid letting outdated CI runs continue if a PR receives
new changes. Outside a PR we let them continue running
by tying the concurr

CI/GHA: cancel outdated CI runs on new PR changes

Avoid letting outdated CI runs continue if a PR receives
new changes. Outside a PR we let them continue running
by tying the concurrency to the commit hash instead.

Also only let one CodeQL or Hacktoberfest job run at a time.

Other CI platforms we use have this build in, but GitHub
unfortunately neither by default nor with a simple option.

This saves CI resources and therefore a little energy.

Approved-by: Daniel Stenberg
Approved-by: Max Dymond
Closes #9533

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GHA: run proselint on markdown files

Co-authored-by: Marc Hörsken

Closes #9520