build(gh): update checklist of issue / discussion template

.github/DISCUSSION_TEMPLATE/general.yml

@@ -5,8 +5,8 @@ body:
       description: Following the guidelines can make you more likely to get responses.
       options:
         - label: >-
-            I'm willing to follow the 
+            I have read and accepted the
-            [Contributing Guidelines](https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/docs/CONTRIBUTING.md).
+            [contributing guidelines](https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/docs/CONTRIBUTING.md).
           required: true
 
   - type: dropdown

.github/DISCUSSION_TEMPLATE/q-a.yml

@@ -5,8 +5,8 @@ body:
       description: Following the guidelines can make you more likely to get responses.
       options:
         - label: >-
-            I'm willing to follow the
+            I have read and accepted the
-            [Contributing Guidelines](https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/docs/CONTRIBUTING.md).
+            [contributing guidelines](https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/docs/CONTRIBUTING.md).
           required: true
 
   - type: dropdown

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -7,8 +7,8 @@ body:
       description: Following the guidelines can make you more likely to get responses.
       options:
         - label: >-
-            I'm willing to follow the
+            I have read and accepted the
-            [Contributing Guidelines](https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/docs/CONTRIBUTING.md).
+            [contributing guidelines](https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/docs/CONTRIBUTING.md).
           required: true
 
   - type: dropdown
@@ -44,6 +44,8 @@ body:
     attributes:
       label: Expected Behavior
       description: A concise description of what you expected to happen.
+    validations:
+      required: true
 
   - type: textarea
     attributes:

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -9,8 +9,8 @@ body:
       description: Following the guidelines can make you more likely to get responses.
       options:
         - label: >-
-            I'm willing to follow the
+            I have read and accepted the
-            [Contributing Guidelines](https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/docs/CONTRIBUTING.md).
+            [contributing guidelines](https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/docs/CONTRIBUTING.md).
           required: true
 
   - type: textarea