Extend icon coverage on remotes and file extensions (#3484)

- **PR Description**

Initially I opened #3426 issue, this PR is targeted to fix that.

- **Please check if the PR fulfills these requirements**

* [X] Cheatsheets are up-to-date (run `go generate ./...`)
* [X] Code has been formatted (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#code-formatting))
* [ ] Tests have been added/updated (see
[here](https://github.com/jesseduffield/lazygit/blob/master/pkg/integration/README.md)
for the integration test guide)
* [X] Text is internationalised (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#internationalisation))
* [X] Docs (specifically `docs/Config.md`) have been updated if
necessary
* [X] You've read through your own file changes for silly mistakes etc

This is the result from the remote icons that I posted on the issue.
Note: The FreeBSD only is triggered if the remote is "git.FreeBSD.org",
note the capitalization

Edit: btw, there are also icons for gitea -> `nf-linux-gitea`, \uf339, 
and forgejo -> `nf-linux-forgejo`, \uf335,  if someone is interested on
some instances that use that sofware.


![image](https://github.com/jesseduffield/lazygit/assets/53124818/d68aa9a1-5a3d-446a-af38-650754056f06)

Would be nice if in the future the user can make overrides via config
file.
```yml
icon_overrides:
  filenames:
    Cargo.toml: 🦀
    Cargo.lock: 🦀
  extensions:
    rs: 🦀
    nix: ❄
```

Fix #3426

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