Gitea: add separate issue templates for bug, design and todo

.gitea/issue_template/bug.yaml

@@ -27,6 +27,7 @@ body:
                 If a report is tagged with Needs Information from User and it has no reply after a week, we will assume the issue is gone and close the report.
 
   - type: textarea
+    id: body
     attributes:
       label: "Description"
       value: |

.gitea/issue_template/design.yaml

@@ -0,0 +1,10 @@
+name: Design
+about: Create a design task (for developers only)
+labels:
+  - design
+ref: master
+body:
+  - type: textarea
+    id: body
+    attributes:
+      label: "Description"

.gitea/issue_template/todo.yaml

@@ -0,0 +1,10 @@
+name: To Do
+about: Create a to do task (for developers only)
+labels:
+  - todo
+ref: master
+body:
+  - type: textarea
+    id: body
+    attributes:
+      label: "Description"