add geany customization

[anconrad]

sudo flatpak override --env=GTK_THEME=Adwaita:dark org.geany.Geany

https://www.geany.org/download/themes/

/var/lib/flatpak/app/org.geany.Geany/x86_64/stable/active/share/geany/colorschemes/

[christophdb]

Plugin: Speicheraktionen.
aktives Plugin in geany.conf und dann separate konfigurationsdatei für saveactions...