Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

+---
+name: Bug report
+about: Create a report to help us improve Wiki.js
+title: ''
+labels: ''
+assignees: NGPixel
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Host Info (please complete the following information):**
+ - OS: [e.g. Ubuntu 18.04, Docker]
+ - Wiki.js version: [e.g. 2.0.0-beta.115]
+ - Database engine: [e.g. postgres 9.7, mysql 5.7]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+!! IMPORTANT !!
+Do not submit feature requests here. Use our feature request board instead:
+
+https://requests.requarks.io/wiki

.github/ISSUE_TEMPLATE/question---help.md

+---
+name: Question / Help
+about: Need help installing, configuring or using Wiki.js?
+title: ''
+labels: help
+assignees: NGPixel
+
+---
+
+**Question**
+Describe in details what you are trying to achieve and where do you need guidance.
+
+**Host Info (please complete the following information):**
+OS: [e.g. Ubuntu 18.04, Docker]
+Wiki.js version: [e.g. 2.0.0-beta.115]
+Database engine: [e.g. postgres 9.7, mysql 5.7]