Make Dependency required: real and add Overview guidance to blank forms (#183)

Author: ale210

.github/ISSUE_TEMPLATE/blank-issue-form-with-dependency.yml

@@ -8,14 +8,16 @@ body:
     attributes:
       label: Dependency
       description: 'Add dependencies (ideally by issue #)'
-      value: '- [ ]'
+      placeholder: '- [ ]'
     validations:
       required: true
   - type: textarea
     id: overview
     attributes:
       label: Overview
       description: Clearly state the purpose of this issue in 2 sentences or less
+      placeholder: |
+        Example: As a [developer/programmer/designer/member of the team/etc], we need to [insert some sort of standard, such as "keep out code clean" or "fix bugs" or "make sure website appears welcoming"]. For this issue, we will [do something to fulfill our standard, such as "edit the code in the data folder" or "correct a bug in out components" or "increase the title size on the homepage"].
     validations:
       required: true
   - type: textarea

.github/ISSUE_TEMPLATE/blank-issue-form-with-no-dependency.yml

@@ -8,6 +8,8 @@ body:
     attributes:
       label: Overview
       description: Clearly state the purpose of this issue in 2 sentences or less
+      placeholder: |
+        Example: As a [developer/programmer/designer/member of the team/etc], we need to [insert some sort of standard, such as "keep out code clean" or "fix bugs" or "make sure website appears welcoming"]. For this issue, we will [do something to fulfill our standard, such as "edit the code in the data folder" or "correct a bug in out components" or "increase the title size on the homepage"].
     validations:
       required: true
   - type: textarea