build: include build metadata

[nullishamy]

Is there an existing issue outlining your problem?

• I have searched the existing issues and they do not solve my problem.

Describe the issue.

We should embed a metadata file in each zip, so that we can track down what version etc people are running when they submit issues (despite there being a question regarding running latest...). This file should be solely maintained by us, and should not involve users.

Things to include:

• Tag (vx.x.x)
• Git hash
• Enabled tweaks

The updating / generation of these values should be completely automated.

[nullishamy]

We should include the fetching of this data as a script (maybe a flag of the install script?), and we should also include the symlink state of ~/.config/gtk-4.0 whilst we're at it.

[nullishamy]

Should go in an existing script, as to not tie people to our install system. This is also useful because generally people will mess up the symlinks when doing it manually.