Update request feature link (#5968)

Feature requests are now collected using the org wide GitHub Community.
Update the link accordingly.

While at it, also remove the unused ISSUE_TEMPLATE.md and align the
title to create issues with what is used in Home Assistant Core's
template.

.github/ISSUE_TEMPLATE.md

@@ -1,69 +0,0 @@
----
-name: Report a bug with the Supervisor on a supported System
-about: Report an issue related to the Home Assistant Supervisor.
-labels: bug
----
-
-<!-- READ THIS FIRST:
-- If you need additional help with this template please refer to https://www.home-assistant.io/help/reporting_issues/
-- This is for bugs only. Feature and enhancement requests should go in our community forum: https://community.home-assistant.io/c/feature-requests
-- Provide as many details as possible. Paste logs, configuration sample and code into the backticks. Do not delete any text from this template!
-- If you have a problem with an add-on, make an issue in it's repository.
--->
-
-<!--
-Important: You can only fill a bug repport for an supported system! If you run an unsupported installation. This report would be closed without comment.
--->
-
-### Describe the issue
-
-<!-- Provide as many details as possible. -->
-
-### Steps to reproduce
-
-<!-- What do you do to encounter the issue. -->
-
-1. ...
-2. ...
-3. ...
-
-### Enviroment details
-
-<!-- You can find these details in the system tab of the supervisor panel, or by using the `ha` CLI. -->
-
-- **Operating System:**: xxx
-- **Supervisor version:**: xxx
-- **Home Assistant version**: xxx
-
-### Supervisor logs
-
-<details>
-<summary>Supervisor logs</summary>
-<!--
-- Frontend -> Supervisor -> System
-- Or use this command: ha supervisor logs
-- Logs are more than just errors, even if you don't think it's important, it is.
--->
-
-```
-Paste supervisor logs here
-
-```
-
-</details>
-
-### System Information
-
-<details>
-<summary>System Information</summary>
-<!--
-- Use this command: ha info
--->
-
-```
-Paste system info here
-
-```
-
-</details>
-

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,4 +1,4 @@
-name: Bug Report Form
+name: Report an issue with Home Assistant Supervisor
 description: Report an issue related to the Home Assistant Supervisor.
 body:
   - type: markdown

.github/ISSUE_TEMPLATE/config.yml

@@ -13,7 +13,7 @@ contact_links:
     about: Our documentation has its own issue tracker. Please report issues with the website there.
 
   - name: Request a feature for the Supervisor
-    url: https://community.home-assistant.io/c/feature-requests
+    url: https://github.com/orgs/home-assistant/discussions
     about: Request an new feature for the Supervisor.
 
   - name: I have a question or need support