Add issue templates for "undesired" issue types (#705)

Author: Chicken

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,13 @@
+---
+name: Feature request
+about: 'Feature requests belong to our Discord!'
+title: ''
+labels: ''
+assignees: ''
+---
+
+<!-- 
+Please don't make an issue.
+Make sure you read the Contribution-Guidelines (https://github.com/BlueMap-Minecraft/BlueMap/blob/master/.github/CONTRIBUTING.md)
+Discuss your feature request in our Discord server's #suggestions channel. (https://discord.gg/zmkyJa3)
+-->

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,13 @@
+---
+name: Question
+about: 'Ask your questions in our Discord!'
+title: ''
+labels: ''
+assignees: ''
+---
+
+<!-- 
+Please don't make an issue.
+Make sure you read the Contribution-Guidelines (https://github.com/BlueMap-Minecraft/BlueMap/blob/master/.github/CONTRIBUTING.md)
+Ask your question in our Discord server. (https://discord.gg/zmkyJa3)
+-->