remove github sources

.github/CONTRIBUTING.md

@@ -1,11 +0,0 @@
-### Reporting Bugs and getting help
-
-The issue tracker on Github is for bug reports only. It is not a general support forum.
-
-**A bug is everything you can reproduce. ie *if I do this that happens but something else should happen instead*.**
-
-Please search the issue tracker (including closed issues). Your bug might be a server bug that has already been addressed.
-
-Please fill in the template when creating new issues and provide information about your device and your server. The [adb logcat](https://wiki.cyanogenmod.org/w/Doc:_debugging_with_logcat) can be omitted if you can reproduce the bug under every condition. (ie *click button X and the application crashes*) But the adb logcat is required if the bug happens only under certain conditions or involves network problem (Server not found, messages not arriving) 
-
-**If you are seeking help or are unable to reproduce the exact problem please join our MUC at conversations@conference.siacs.eu**

.github/FUNDING.yml

@@ -1,2 +0,0 @@
-liberapay: inputmice
-custom: https://paypal.me/ConversationsIM

.github/ISSUE_TEMPLATE.md

@@ -1,35 +0,0 @@
-#### General information
-
-* **Version:** 2.5.3
-* **Device:** Xiaomi Mi A1
-* **Android Version:**  Android 9 (stock)
-* **Server name:** conversations.im, jabber.at or self hosted
-* **Server software:** ejabberd 16.04 or prosody 0.10 (if known)
-* **Installed server modules:** Stream Managment, CSI, MAM
-* **Conversations source:** PlayStore, PlayStore Beta Channel, F-Droid, self build (latest HEAD)
-
-
-#### Steps to reproduce
-
-1. …
-2. …
-
-
-#### Expected result
-
-What is the expected output? 
-
-
-#### Actual result
-
-What do you see instead?
-
-
-#### Debug output
-
-Please post the output of adb logcat. The log should begin with the start of Conversations and include all the
-steps it takes to reproduce the problem.
-
-````
-adb logcat -s conversations
-````