Improve Issue Templates (#70)

* Improve Issue Templates

* simplified pr template

.github/ISSUE_TEMPLATE/BUG_REPORT.yml

@@ -1,6 +1,6 @@
 name: "Bug report 🐛"
 description: Report errors or unexpected behavior
-title: "Bug Report: "
+title: "Bug: "
 labels:
   - bug
   - backlog

.github/ISSUE_TEMPLATE/DOCUMENTATION_ISSUE.yml

@@ -1,10 +1,9 @@
 name: "Documentation Issue 📚"
 description: Report issues in our documentation
-title: " "
+title: "Documentation: "
 labels:
   - documentation
   - backlog
-assignees: " "
 
 body:
   - type: markdown

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.yml

@@ -1,6 +1,6 @@
 name: "Feature Request & Ideas 🚀"
 description: Suggest a new feature or improvement (this does not mean you have to implement it)
-title: "Feature Request: "
+title: "Feature: "
 labels:
   - feature
   - backlog

.github/PULL_REQUEST_TEMPLATE.md

@@ -9,8 +9,5 @@
 * [ ] Closes Issue #xxx
 * [ ] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
 
-<!-- Provide a more detailed description of the PR, other things fixed or any additional comments/features here -->
-## Detailed Description of the Pull Request / Additional comments
-
 <!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well -->
 ## Validation Steps Performed