vdirsyncer rename main calendar, set collections

Rename account "personal" -> "main", it was messing with khalel
tagging of "personal" collection inside "personal" calendar

Set collections to personal, work, and other

Only metasync displayname

system/home/calendar/default.nix

@@ -20,7 +20,7 @@
   accounts.calendar = {
     basePath = "Calendar";
     accounts = {
-      personal =
+      main =
         let
           url = "dav.xenia.me.uk";
         in
@@ -45,11 +45,12 @@
           vdirsyncer = {
             inherit (config.programs.vdirsyncer) enable;
             auth = "basic";
-            collections = [ "from a" ];
-            metadata = [
-              "color"
-              "displayname"
+            collections = [
+              "personal"
+              "work"
+              "other"
             ];
+            metadata = [ "displayname" ];
             timeRange = {
               start = "datetime.now() - timedelta(days=365)";
               end = "datetime.now() + timedelta(days=365)";