chore(kate): Move kate back to "common" as it is cross-platform

- Link Kwrite config with Kate

common/.config/kate/externaltools/Search%20KDE%20API.ini

@@ -0,0 +1,12 @@
+[General]
+actionName=externaltool_KDEAPI
+arguments="https://api.kde.org/search.html?query=%{Document:Selection:Text}"
+category=Tools
+executable=xdg-open
+icon=kde
+name=Search KDE API
+output=Ignore
+reload=false
+save=None
+trigger=None
+workingDir=%{Document:Path}