Minor documentation and script cleanups (#6868)

* Remove mention of no longer used IRC network

Channels exist on matrix, and on libera.chat now.

* Correctly match only files with .png extension

The current search would match files such as 'createpng'.

* Fix comparison in script

The result was always false, due to comparing a literal string instead of a variable.

* Use correct license files from upstream

Correct license files obtained from:
https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
https://www.gnu.org/licenses/gpl-3.0.txt
https://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
https://www.gnu.org/licenses/lgpl-3.0.txt

* Refresh several shell scripts

This fixes several shellcheck warnings, as well as makes the code more
robust and have consistent codestyle between all the files.

* Trim excess whitespace
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@ -48,7 +48,7 @@ Detailed instructions are available in the [Build and Install](./INSTALL.md) pag
## Contributing
We are always looking for suggestions on how to improve KeePassXC. If you find any bugs or have an idea for a new feature, please let us know by opening a report in the [issue tracker](https://github.com/keepassxreboot/keepassxc/issues) on GitHub or join us on IRC in [freenode](https://webchat.freenode.net/) channels #keepassxc and #keepassxc-dev.
We are always looking for suggestions on how to improve KeePassXC. If you find any bugs or have an idea for a new feature, please let us know by opening a report in the [issue tracker](https://github.com/keepassxreboot/keepassxc/issues) on GitHub, or join us on [Matrix community channel](https://matrix.to/#/!zUxwGnFkUyycpxeHeM:matrix.org?via=matrix.org) or [Matrix development channel](https://matrix.to/#/!RhJPJPGwQIFVQeXqZa:matrix.org?via=matrix.org), or on IRC in [Libera.Chat](https://web.libera.chat/) channels #keepassxc and #keepassxc-dev.
You may directly contribute your own code by submitting a pull request. Please read the [CONTRIBUTING](.github/CONTRIBUTING.md) document for further information.