simpler feature and model request forms

.github/ISSUE_TEMPLATE/20_feature_request.yml

+---
 name: Feature request
+about: Request a new feature
 labels: ['feature request']
-description: Request a new feature.
-body:
-  - type: textarea
-    id: problem
-    attributes:
-      label: What new feature would you like to see?
-      description: Tell us about the problem you're trying to solve.
-    validations:
-      required: false
+---
+

.github/ISSUE_TEMPLATE/30_model_request.yml

+---
 name: Model request
+about: Request support for a new model to be added to Ollama
 labels: ['model request']
-description: Request a new model.
-body:
-  - type: textarea
-    id: problem
-    attributes:
-      label: What model would you like?
-      description: Please provide a link to the model.
+---
+