Update README and CONTRIBUTING (#1905)

Author: rfc2822

CONTRIBUTING.md

@@ -14,24 +14,11 @@ If you send us a pull request, our CLA bot will ask you to sign the
 Contributor's License Agreement so that we can use your contribution.
 
 
-# Copyright
+# Copyright notice
 
 Make sure that every file that contains significant work (at least every code file)
-starts with the copyright header:
-
-```
-/*
- * Copyright © All Contributors. See LICENSE and AUTHORS in the root directory for details.
- */
-```
-
-You can set this in Android Studio:
-
-1. Settings / Editor / Copyright / Copyright Profiles
-2. Paste the text above (without the stars).
-3. Set Formatting so that the preview exactly looks like above; one blank line after the block.
-4. Set this copyright profile as the default profile for the project.
-5. Apply copyright: right-click in file tree / Update copyright.
+starts with the copyright header. Android Studio should do so automatically because the
+configuration is stored in the repository (`.idea/copyright`).
 
 
 # Style guide
@@ -110,8 +97,3 @@ Test classes should be in the appropriate directory (see existing tests) and in
 tested class. Tests are usually be named like `methodToBeTested_Condition()`, see
 [Test apps on Android](https://developer.android.com/training/testing/).
 
-
-# Authors
-
-If you make significant contributions, feel free to add yourself to the [AUTHORS file](AUTHORS).
-

README.md

@@ -1,18 +1,20 @@
 
+[![Follow @davx5app@fosstodon.org](https://img.shields.io/mastodon/follow/109598783742737223?domain=https%3A%2F%2Ffosstodon.org&style=flat-square)](https://fosstodon.org/@davx5app)
 [![Website](https://img.shields.io/website?style=flat-square&up_color=%237cb342&url=https%3A%2F%2Fwww.davx5.com)](https://www.davx5.com/)
-[![F-Droid](https://img.shields.io/f-droid/v/at.bitfire.davdroid?style=flat-square)](https://f-droid.org/packages/at.bitfire.davdroid/)
 [![License](https://img.shields.io/github/license/bitfireAT/davx5-ose?style=flat-square)](https://github.com/bitfireAT/davx5-ose/blob/main/LICENSE)
-[![Follow @davx5app@fosstodon.org](https://img.shields.io/mastodon/follow/109598783742737223?domain=https%3A%2F%2Ffosstodon.org&style=flat-square)](https://fosstodon.org/@davx5app)
-[![Development tests](https://github.com/bitfireAT/davx5-ose/actions/workflows/test-dev.yml/badge.svg)](https://github.com/bitfireAT/davx5-ose/actions/workflows/test-dev.yml)
+[![F-Droid](https://img.shields.io/f-droid/v/at.bitfire.davdroid?style=flat-square)](https://f-droid.org/packages/at.bitfire.davdroid/)
+![GitHub Downloads (all assets, all releases)](https://img.shields.io/github/downloads/bitfireAT/davx5-ose/total?label=GitHub%20downloads)
 
 ![DAVx⁵ logo](app/src/main/res/mipmap-xxxhdpi/ic_launcher.png)
 
 
 DAVx⁵
 ========
 
-Please see the [DAVx⁵ Web site](https://www.davx5.com) for
-comprehensive information about DAVx⁵, including a list of services it has been tested with.
+> [!IMPORTANT]
+> Please see the [DAVx⁵ Web site](https://www.davx5.com) for
+> comprehensive information about DAVx⁵, including a list of services it has been tested with,
+> a manual and FAQ.
 
 DAVx⁵ is licensed under the [GPLv3 License](LICENSE).