Update degoogle.yml

Remove nextcloud from mail provider. Nextcloud is not a mail server, no apps(plugin) in the Nextcloud provided such function either. What it's capable of is as a mail client. There are it's own mail client and rainloop for nextcloud. Not a mail server.

yaml/degoogle.yml

@@ -629,11 +629,6 @@ web based products:
       eyes: 9
       text: |
         Privacy focusued email provider. Thanks @petertorelli
-    - name: nextCloud
-      url: https://help.nextcloud.com/t/nextcloud-mail-server/157
-      eyes: null
-      text: |
-        Now also provides an email service (self-hosted). Thanks @je-vv
     - name: Anonymize.com Email
       url: https://anonymize.com/
       eyes: null