chore: rework issue templates, and add a link to the forum

Author: Julusian

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,49 @@
+name: Bug report 🐛
+description: Use this if you've found a bug
+title: "Bug: [Short description of the bug]"
+labels:
+  - type/bug
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Before you post, make sure to check for existing bug reports of the issue:
+        https://github.com/CasparCG/server/issues?q=+is%3Aissue+label%3Atype%2Fbug
+
+  - type: textarea
+    attributes:
+      label: Observed Behavior
+      description: What happened?
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Expected behaviour
+      description: What did you expect to happen?
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Steps to reproduce
+      description: How can we reproduce the issue?
+      value: |
+        1.
+        2.
+        3. ...
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Environment
+      description: What version of CasparCG and OS are you using?
+      value: |
+        * Commit: [e.g. ab1234c]
+        * Server version: [e.g. v2.2]
+        * Operating system: [e.g. Windows 10]
+    validations:
+      required: true
+      

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Question or need help?
+    url: https://casparcgforum.org/
+    about: Ask the community here.

.github/ISSUE_TEMPLATE/config.yml

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+name: Feature request
+description: Suggest an idea for this project
+labels:
+  - type/enhancement
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Before you post, make sure to check for existing matching feature requests:
+        https://github.com/CasparCG/server/issues?q=+is%3Aissue+label%3Atype%2Fbug
+
+  - type: textarea
+    attributes:
+      label: Description
+      description: How should the feature/enhancement work?
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Solution suggestion
+      description: If you have any suggestions on how the solution should work, add that here.