dnf install fedora-workstation-repositories, wiki, pkg README, pkg repo mirrors

[Wes Turner]

Installing the `fedora-workstation-repositories` package adds the `.repo`
files (`baseurl`, `gpgkey`,) for Chrome, PyCharm, RPMFusion (NVIDIA
drivers, [...]), and Steam to `/etc/yum.repos.d/` so that dnf will install
and update from those third-party repositories (which may or may not have
their own package mirroring system).

The wiki doesn't yet link to fedora-workstation-repositories in a couple
places:

## wiki:Third_party_repositories
- https://fedoraproject.org/wiki/Third_party_repositories links to
  -
https://askbot.fedoraproject.org/en/question/39797/sticky-what-third-part...
  - but there's nothing about fedora-workstation-repositories (or [*] how
to list what's in there)
  - [ ] Link to the docs: [fedora-workstation-repositories]

## Article re: fedora-workstation-repositories
- url: https://fedoramagazine.org/third-party-repositories-fedora/
- datePublished: 2018-04-27
- `dnf install fedora-workstation-repositories`
- Packages:
>  - Google Chrome — a web browser (Fedora 27 & Fedora 28)
>  - PyCharm — a Python IDE (Fedora 27 & Fedora 28)
>  - NVIDIA graphics drivers (Fedora 28 only)
>  - Steam 
## fedora-workstation-repositories
- Source: https://src.fedoraproject.org/rpms/fedora-workstation-repositories
  - [ ] README: Link to the docs
- Docs:
https://fedoraproject.org/wiki/Workstation/Third_Party_Software_Repositor...
:

- Packages:
  - PyCharm, Chrome, NVIDIA, Steam
  - [*] List of files included:
https://src.fedoraproject.org/rpms/fedora-workstation-repositories/tree/m...


## Mirroring
- Hopefully each .repo baseurl= in yum.repos.d points to a local and/or
scalable package mirror with a GPG key (and possibly an SSL cert signed
with a CA in the ca-certificates trust root).

fedora-workstation-repositories repo mirrors:

- Chrome:
- PyCharm:
- NVIDIA:
- Steam:

Third-party Fedora repo mirrors:

- https://pkg.cloudflare.com/ only supports Ubuntu, Debian, RHEL & CentOS &?
  - https://cloudflaremirrors.com/ only lists Arch and Debian
- https://mirror.facebook.net/fedora/
- https://mirror.facebook.net/fedora/linux/releases/33/

Fedora repo mirrors:

- https://fedoraproject.org/wiki/Infrastructure/Mirroring
- https://admin.fedoraproject.org/mirrormanager/