feat: add support for placeholder escaping, prep for release, misc

[kbdharun]

Changes

• Add support for placeholder escaping to comply with the latest specification.
• Add "tldr-pages contributors" to the copyright name beside the original client author.
• Remove the contact email of the original author since they aren't involved anymore.
• Update PyPi categories in setup.py adding Python 3.12 and BSD platforms as supported.
• Update the docs directory in the .gitignore file and add a man page for local builds (Build wheel unable to find documentation files (building from 2024-02-24 repo) #233).
• Update Snapcraft (snap) config to core24 (Ubuntu LTS 24.04) and Python 3.12 (also removed some unnecessary comments).
• Minor fixes to README and add Snap release badge.
• Add CHANGELOG, bump, and client spec versions to 3.3.0 and v2.2, respectively.

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I have been working on this since yesterday, and the changes are finally done. After this PR's merge, I will create a new release and once it is done will bump the Snapcraft files version.

This time the changelog is really big xD.

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Related issues

• Closes Build wheel unable to find documentation files (building from 2024-02-24 repo) #233
• Closes Plans for new release? #237

Sample Screenshots

Placeholder escaping

For more details check out https://github.com/search?q=repo%3Atldr-pages%2Ftldr+%5C%7B%5C&type=code

New badge in README

[patricedenis]

It looks good ! All of those improvements, congrats @kbdharun and thanks !
I found a few minor addition that I could suggest, I will add them shortly.

[kbdharun]

I found a few minor addition that I could suggest, I will add them shortly.

If it's related to the PR feel free to suggest it here, if it's a new feature/minor update sure we can add it later.

[patricedenis]

Yeah thanks, I've just made a PR to this branch because I was not able to add it directly from the review process.

[patricedenis]

Ok @kbdharun : my PR on the brand does not seem to wook properly.
The suggestion was to replace the line 60 on README.md from :
[linux, osx, sunos, windows, common]
to
[android, linux, osx, sunos, windows, freebsd, netbsd, openbsd, common]

or better : android, freebsd, linux, netbsd, openbsd, osx, sunos, windows, common
as you had written in the man doc.