appdata: Update appdata

See merge request !21

- Add developer_name and developer > name tags
- Use desktop-application type for component due to Flathub
- Update content_rating version

DOAP: Replace defunct mailing list

See merge request !20

Corresponding tag (https://discourse.gnome.org/tag/gnome-power-manager) seems empty.

appdata: Update appdata

See merge request !19

- Update the screenshots URLs
- Update the donation URL
- Add vcs-browser and translate URLs
- Add missing launchable tag

Fixes #25

egg-graph: use theme color for axes label text

See merge request !12

desktop: Remove obsolete Bugzilla entries

See merge request !15

The X-GNOME-Bugzilla-* entries were for use by bug-buddy, a GNOME 2
technology that's been gone for over a decade. These entries are
obsolete and can be removed.

Sveinn í Felli authored Sep 06, 2022 and Administrator committed Sep 06, 2022

(cherry picked from commit 246ba79c)

Improved link to homepage

See merge request !14

Convert README to MD

See merge request !13

The labels were not readable when using dark themes, since it was using a
hard-coded color.

Quentin PAGÈS authored May 13, 2021 and Administrator committed May 13, 2021

(cherry picked from commit ec04d4d3)

Closes: #10

Closes #10

See merge request !7

Closes:#2

See merge request !9