Improve issue templates via title prefixes (#1121)

* Update and rename feature_request.md to idea.md

* Update problem_report.md

* Update website_change.md

Co-authored-by: Carrie Roberts <clr2of8@gmail.com>

.github/ISSUE_TEMPLATE/idea.md

@@ -1,8 +1,8 @@
 ---
-name: Feature request
-about: Suggest a new feature or other enhancement.
-title: ''
-labels: 'feature'
+name: Idea
+about: An idea for a feature or improvement to Atomic Red Team. 
+title: 'Idea: '
+labels: 'idea'
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/problem_report.md

@@ -1,7 +1,7 @@
 ---
 name: Problem
 about: Tell us about a problem you've encountered.
-title: ''
+title: 'Problem: '
 labels: 'problem'
 assignees: ''
 

.github/ISSUE_TEMPLATE/website_change.md

@@ -1,7 +1,7 @@
 ---
 name: Website change
 about: Propose a change to the website at https://atomicredteam.io
-title: ''
+title: 'Website: '
 labels: 'website'
 assignees: ''