refactor: Rename all remaining conduwuit references to Continuwuity

Also adds an alias for the old binary name to the dockerfile

Supersedes !1485
Closes #1536
Closes #2277

pkg/debian/config

@@ -6,13 +6,13 @@ set -e
 #. /usr/share/debconf/confmodule
 #
 ## Ask for the Matrix homeserver name, address and port.
-#db_input high conduwuit/hostname || true
+#db_input high continuwuity/hostname || true
 #db_go
 #
-#db_input low conduwuit/address || true
+#db_input low continuwuity/address || true
 #db_go
 #
-#db_input medium conduwuit/port || true
+#db_input medium continuwuity/port || true
 #db_go
 
 exit 0