Issue forms: remove old template

Signed-off-by: Ekaterina Gerasimova <kittykat3756@gmail.com>

.github/ISSUE_TEMPLATE.md

@@ -1,48 +0,0 @@
-<!-- A picture's worth a thousand words: PLEASE INCLUDE A SCREENSHOT :P -->
-
-<!-- Please report security issues by email to security@matrix.org -->
-
-<!-- This is a bug report template. By following the instructions below and
-filling out the sections with your information, you will help the us to get all
-the necessary data to fix your issue.
-
-You can also preview your report before submitting it. You may remove sections
-that aren't relevant to your particular case.
-
-Text between <!-- and --​> marks will be invisible in the report.
--->
-
-#### Description
-
-Describe here the problem that you are experiencing, or the feature you are requesting.
-
-#### Steps to reproduce
-
-- For bugs, list the steps
-- that reproduce the bug
-- using hyphens as bullet points
-
-Describe how what happens differs from what you expected.
-
-Log: sent/not sent?    <!-- You can send us the app's logs via the 'Report bug'
-link on the 'Settings' page. Very important for hard-to-reproduce bugs. Please
-file a bug here too! -->
-
-<!-- Include screenshots if possible: you can drag and drop images below. -->
-
-#### Version information
-
-<!-- IMPORTANT: please answer the following questions, to help us narrow down the problem -->
-
-- **Platform**: web (in-browser) or desktop?
-
-For the web app:
-
-- **Browser**: Chrome, Firefox, Safari, Edge? which version?
-- **OS**: Windows, macOS, Ubuntu, Arch Linux, etc?
-- **URL**: develop.element.io / app.element.io / somewhere else? If a private server, what version of Element Web?
-
-For the desktop app:
-
-- **OS**: Windows, macOS, Ubuntu, Arch Linux, etc?
-- **Version**: 1.x.y <!-- check the user settings panel if unsure -->