webui: adding PRETTY_NAME to use in title instead of anaconda generic title

[acruzgon]

According to UX, "Anaconda" should never show to people to avoid confusion. This PR is to start using PRETTY_NAME instead of the generic Anaconda title.

Before:

After:

[KKoukiou]

Some small fixups needed. Also tests :)

[garrett]

Thanks for making this change!

There's a minor difference what what I intended: I was thinking of having the full distribution name + version at the top and the welcome to message only have the distribution name (without version).

[VladimirSlavik]

Thank you!

1. I'm not sure this is the right place where the data should come from. Take a look at pyanaconda/product.py - that loads /.buildstamp and environment variables. This should work similarly, in fact we already get isFinal from buildstamp in betanag.js. Sorry, I see this is proposed to be done like this. In that case it's fine.

2. I don't think conf.js is the right place for the helper. That file contains the custom parser for anaconda config, which is a pretty specific thing. Maybe some other helper with things for the "product" information? Maybe some reorganization is in order, so that the betanag stuff and anything else reading buildstamp are together?

Apart from that, this looks good to me.

[acruzgon]

@garrett it would like this:

is that okay? also do you want to keep ! after the welcome message?

[KKoukiou]

Please don't include merge commits and/or empty commits in your PRs.

[KKoukiou]

/kickstart-test --waive webui only

[garrett]

is that okay?

@acruzgon: That looks good!

also do you want to keep ! after the welcome message?

No, we don't need to. It would fit right in with Fedora, but would probably be a bit much in the context of RHEL and CentOS.

[KKoukiou]

/kickstart-test --waive webui only