Add theme ethereal (#3464)

* Add theme Ethereal

* Update to follow the Omarchy hot reload

* Add aether to all themes

* Add a vscode theme

* Revert "Add aether to all themes"

This reverts commit 421f467e213150254ab10dbe09dd6382bf6c54eb.

* Format the kitty file

* Make available to all via migration

* Fix

* Add hot reload

* Change the background image to something of higher quality

This looks a lot better on a 6K monitor

* Highlight border color should be brighter than inactive color

* Add preview.png for new visual theme selector

* Add the ethereal nvim variant of aehter

---------

Co-authored-by: David Heinemeier Hansson <david@hey.com>

migrations/1763583093.sh

@@ -0,0 +1,6 @@
+echo "Make ethereal available as new theme"
+
+if [[ ! -L ~/.config/omarchy/themes/ethereal ]]; then
+  rm -rf ~/.config/omarchy/themes/ethereal
+  ln -nfs ~/.local/share/omarchy/themes/ethereal ~/.config/omarchy/themes/
+fi