Cleanup of PR and issue templates (#31070)

* Remove old issue template

* Small wording improvement

* Consistency

* Configuration fix

* Process review suggestions

.github/ISSUE_TEMPLATE.md

@@ -1,48 +0,0 @@
-<!-- READ THIS FIRST:
-- If you need additional help with this template please refer to https://www.home-assistant.io/help/reporting_issues/
-- Make sure you are running the latest version of Home Assistant before reporting an issue: https://github.com/home-assistant/home-assistant/releases
-- Frontend issues should be submitted to the home-assistant-polymer repository: https://github.com/home-assistant/home-assistant-polymer/issues
-- iOS issues should be submitted to the home-assistant-iOS repository: https://github.com/home-assistant/home-assistant-iOS/issues
-- Android issues should be submitted to the home-assistant-android repository: https://github.com/home-assistant/home-assistant-android/issues
-- Do not report issues for integrations if you are using custom integration: files in <config-dir>/custom_components
-- 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!
--->
-
-**Home Assistant release with the issue:**
-<!--
-- Frontend -> Developer tools -> Info
-- Or use this command: hass --version
--->
-
-
-**Last working Home Assistant release (if known):**
-
-
-**Operating environment (Hass.io/Docker/Windows/etc.):**
-<!--
-Please provide details about your environment.
--->
-
-**Integration:**
-<!--
-Please add the link to the documentation at https://www.home-assistant.io/integrations/ of the integration in question.
--->
-
-
-**Description of problem:**
-
-
-
-**Problem-relevant `configuration.yaml` entries and (fill out even if it seems unimportant):**
-```yaml
-
-```
-
-**Traceback (if applicable):**
-```
-
-```
-
-**Additional information:**
-