Update issue templates

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: If you've found something that does not work, please report it to help improve
+  grocy
+title: 'Bug: '
+labels: bug
+assignees: ''
+
+---
+
+Please describe the bug as detailed as possible, provide the steps how to reproduce it and maybe attach screenshots where useful.
+
+Please also check if your bug was maybe already fixed by searching closed issues here or by trying to reproduce your problem on the [pre-release demo](https://demo-prerelease.grocy.info/) (use a *private demo instance* if you want to make your example persistent).
+
+If your problem is not reproducible, it's most likely not a bug - please use the [r/grocy subreddit](https://www.reddit.com/r/grocy) for general questions / help.

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: Ideas for improvements or new things which you would find useful are always
+  welcome
+title: 'Feature Request: '
+labels: enhancement
+assignees: ''
+
+---
+
+Please describe what you would find useful and please also check (by searching open requests here) if that was maybe already requested.