adapt to removed gmail-oauth2

_providers/gmail.md

@@ -18,16 +18,18 @@ server:
 opt:
   delete_to_trash: true
 before_login_hint: |
-  For Gmail accounts, you need to create an app-password if you have "2-Step Verification" enabled. If this setting is not available, you need to enable "less secure apps".
+  For Gmail accounts, you need to create an app-password and have "2-Step Verification" enabled.
 last_checked: 2021-08
 website: https://gmail.com
 ---
 
-To use Delta Chat with your Gmail email address you have to take **one of the following actions**. We prefer the first one, because it is the easiest. If that doesn't suit you, try one of the other options.
+To use Delta Chat with your Gmail email address,
+you need to enable **2-Step Verification** in your Google Account
+and then **Create an app-specific password**.
 
-* **Authenticate using "oauth"**: *This currently works only with Delta Chat Android.* Delta Chat automatically tries this method for recognized Gmail-accounts, it is the extra login dialog you get to see when trying to log in with Delta Chat for the first time. If you cancelled that dialog you may simply start the login process again to authenticate with "oauth".
-* **Create an app-specific password**: This method is only viable if you use "2-Step Verification" for logging into Gmail. It means to create an additional password that allows access to your emails, which you use only for one device or app.  Please [follow Google's instructions](https://support.google.com/accounts/answer/185833), and then use the newly generated password to log in with Delta Chat.
-* **Allow "less-secure apps"**: This sounds like a bad idea, but it actually just enables a very commonly used way to access emails, so don't let yourself be scared away. Please [switch this feature on](https://myaccount.google.com/lesssecureapps), and then log in with Delta Chat just normally.
+This means to create an additional password which you use only for one device or app.
+Please [follow Google's instructions](https://support.google.com/accounts/answer/185833),
+and then use the newly generated password to log in with Delta Chat.
 
 If you still have login problems,
 make sure IMAP is enabled in the Gmail web interface
@@ -36,3 +38,10 @@ at **Settings / See all settings / Forwarding and POP/IMAP / IMAP access / Enabl
 ## Further information
 
 Gmail places some limits on the [amount of emails you may send and receive per day](https://support.google.com/mail/answer/22839).
+
+In the past, we supported Google's Oauth as well.
+Due Google adding more and more bureaucracy in that area,
+we dropped support for that.
+This allows our small open source project
+using our limited resources
+in areas with larger impact.