feat(applications): add .desktop files

applications/me.proton.Mail.desktop

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+[Desktop Entry]
+Name=Proton Mail
+Comment=Proton official desktop application for Proton Mail and Proton Calendar
+GenericName=Proton Mail
+Exec=/usr/bin/flatpak run --branch=stable --arch=x86_64 --command=start-proton-mail --file-forwarding me.proton.Mail @@u %U @@
+Icon=ch.protonmail.protonmail-bridge.svg
+Type=Application
+StartupNotify=true
+Categories=Network;Email;
+MimeType=x-scheme-handler/mailto;
+X-Desktop-File-Install-Version=0.28
+X-Flatpak=me.proton.Mail

applications/tresorit.desktop

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+[Desktop Entry]
+Name=Tresorit
+GenericName=Tresorit
+Comment=Secure file synchronization and sharing
+Categories=Utility;Accessory;Network;
+Version=3.5.1274.4640
+Terminal=false
+Type=Application
+Exec=env QT_SCREEN_SCALE_FACTORS=1.5 /home/stereov/.local/share/tresorit/tresorit %u
+MimeType=x-scheme-handler/tresorit
+Icon=/home/stereov/.local/share/tresorit/tresorit.png