CI/GitHub: Use issue form and add contact links (#26639)

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,14 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Discord
+    url: https://discord.com/invite/3UxRn4Kn?utm_source=Discord%20Widget&utm_medium=Connect
+    about: Chat
+  - name: How to Compile
+    url: https://trinitycore.atlassian.net/
+    about: Wiki
+  - name: Community Support Forum
+    url: https://community.trinitycore.org/
+    about: Forum
+  - name: Discussions
+    url: https://github.com/TrinityCore/TrinityCore/discussions
+    about: Discuss

.github/ISSUE_TEMPLATE/issue.yml

@@ -0,0 +1,68 @@
+name: Generic issue
+description: Report an issue, a suggestion, SQL only fix.
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this form! Please make sure to fill all fields, including the Title above.
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: |
+        Description of the problem or issue here.
+        If this is a crash, post the crashlog (upload to https://gist.github.com/).
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behaviour
+      description: |
+        Tell us what should happen instead.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: Steps to reproduce the problem
+      description: |
+        1. Step 1 include entries of affected creatures / items / quests with a link to the relevant wowhead or https://tcubuntu.northeurope.cloudapp.azure.com/aowow/ page.  
+        2. Step 2
+        3. Step 3
+    validations:
+      required: true
+  - type: dropdown
+    id: branch
+    attributes:
+      label: Branch
+      options:
+        - 3.3.5
+        - master
+    validations:
+      required: true
+  - type: textarea
+    id: commit
+    attributes:
+      label: TC rev. hash/commit
+      description: |
+        Copy the result of server debug command (if you need to run it from client get prat addon)
+    validations:
+      required: true
+  - type: input
+    id: os
+    attributes:
+      label: Operating system
+      description: |
+        Operating System, i.e. Windows 10 x64, Debian 10 x64, etc
+    validations:
+      required: true
+  - type: textarea
+    id: custom
+    attributes:
+      label: Custom changes
+      description: |
+        List which custom changes you have applied, i.e. transmog patch, etc.
+        Write "None" if you don't have any changes applied.
+    validations:
+      required: true