Introduce to Waybar

[Nerox9]

Description of changes

Waybar configuration modified based on the default bar configuration and launchers added.
Pulseaudio, network and battery/power adapter icons implemented.
Weston and waybar launchers are unified and name section added.

Checklist for things done

• Summary of the proposed changes in the PR description
• More detailed description in the commit message(s)
• Commits are squashed into relevant entities - avoid a lot of minimal dev time commits in the PR
• Contribution guidelines followed
• Ghaf documentation updated with the commit - https://tiiuae.github.io/ghaf/
• PR linked to architecture documentation and requirement(s) (ticket id)
• Test procedure described (or includes tests). Select one or more:
  • Tested on Lenovo X1 x86_64
  • [-] Tested on Jetson Orin NX or AGX aarch64
  • [-] Tested on Polarfire riscv64
• Author has run nix flake check --accept-flake-config --allow-import-from-derivation and it passes
• All automatic Github Action checks pass - see actions
• Author has added reviewers and removed PR draft status

Testing

1. Uncomment to set the compositor as "labwc" here.
2. Rebuild with the change.
3. Flash the image and boot.

[leivos-unikie]

None of the demo apps launch by clicking their icons.

Tried to launch zathura also from command line with the command found in /etc/waybar/config
Not launching.

[leivos-unikie]

Tested again. Now apps launch except gala.

[leivos-unikie]

Now all apps launch.

[vilvo]

Minor nix inherit related comment.
Testing-section of the PR requires improvement before I know who to test it.

• "Please note that it works with display as "wayland-0" in waypipe only in guivm.nix" <- what does this mean? The PR has no changes to guivm.nix and the main-branch guivm.nix has no clear indication on what to change to achieve this. Maybe the link is outdated?

Proposal on the PR Testing-section improvements:

1. Detailed instruction to what exactly to change in the guivm.nix - use links to main branch (for example) and example of the exact setting to set - e.g.
   waypipe-display = wayland-0 (<- is non-sense but hope you get the idea)
2. Detailed instruction to what to change in the guivm for labwc. For example,
   profiles.graphics.compositor = "labwc"
3. Rebuild with the settings changes from steps 1. and 2.
4. Flash the image to SSD and boot.

[Nerox9]

Minor nix inherit related comment. Testing-section of the PR requires improvement before I know who to test it.

* "Please note that it works with display as "wayland-0" in waypipe only in [guivm.nix](https://github.com/tiiuae/ghaf/pull/386/files#diff-48f3927dbfa0f525b6dd5c7bc57cc323d0b54bdbd60cf71264f84e0714cdd5f5)" <- what does this mean? The PR has no changes to `guivm.nix` and the [`main`-branch `guivm.nix`](https://github.com/tiiuae/ghaf/blob/main/modules/virtualization/microvm/guivm.nix) has no clear indication on what to change to achieve this. Maybe the link is outdated?

Proposal on the PR Testing-section improvements:

1. Detailed instruction to what exactly to change in the `guivm.nix` - use links to main branch ([for example](https://github.com/tiiuae/ghaf/blob/main/modules/virtualization/microvm/guivm.nix#L2)) and example of the exact setting to set - e.g.
   `waypipe-display = wayland-0` (<- is non-sense but hope you get the idea)

2. Detailed instruction to what to change in the guivm for labwc. For example,
   `profiles.graphics.compositor = "labwc"`

3. Rebuild with the settings changes from steps 1. and 2.

4. Flash the image to SSD and boot.

The display name issue is fixed by the main branch update. The comment of testing is replaced with the steps.