Icons are provided for the main categories known to us.
The distinction between CATEGORY_GROUPS and CATEGORY_NAMES is abandoned in favor
of the latter.
HINT: we need single-color icons; transparent background and the color must be
`currentColor` so that the icons can be used in light/dark themes.
The following SVGs from the ionicons had to be revised (use ``currentColor``).
- client/simple/src/svg/ionicons/logo-rss.svg
- client/simple/src/svg/ionicons/radio-outline.svg
- client/simple/src/svg/ionicons/color-palette-outline.svg
For the following categories, I did not find any usable icons in Ionicons; new
SVGs were created for these categories.
- onions: client/simple/src/svg/ionicons/tor-browser.svg
- lyrics: client/simple/src/svg/ionicons/song-lyric-music.svg [1]
- packages: client/simple/src/svg/ionicons/package_2.svg [1]
[1] Based on Google's Material icons: https://fonts.google.com/icons
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
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