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(cherry picked from commit fc766896705c554a092c00ec8a223dab6512f85b)
Adapt to b6bcb79987 Improve notification
icon and navbar
Refs: https://codeberg.org/forgejo/forgejo/issues/893
[BRANDING] Add Forgejo light variables
Updates the Forgejo light theme with the changes in b6bcb7998
These are the same changes as made in 2574dbcff to the dark theme
Refs: forgejo/forgejo#893
(cherry picked from commit 6fa0d493a169597a8409adf5fe6b6d35aee2fe07)
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