Move about field from issue templates to config.yml

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,6 +1,5 @@
 ---
 name: Bug Report
-about: Bug reports about the Solidity Compiler.
 labels: ["bug :bug:"]
 ---
 

.github/ISSUE_TEMPLATE/config.yml

@@ -2,7 +2,10 @@ blank_issues_enabled: false
 contact_links:
   - name: Bug Report
     url: https://github.com/ethereum/solidity/issues/new?template=bug_report.md&projects=ethereum/solidity/43
+    about: Bug reports about the Solidity Compiler.
   - name: Documentation Issue
     url: https://github.com/ethereum/solidity/issues/new?template=documentation_issue.md&projects=ethereum/solidity/43
+    about: Solidity documentation.
   - name: Feature Request
     url: https://github.com/ethereum/solidity/issues/new?template=feature_request.md&projects=ethereum/solidity/43
+    about: Solidity language or infrastructure feature requests.

.github/ISSUE_TEMPLATE/documentation_issue.md

@@ -1,6 +1,5 @@
 ---
 name: Documentation Issue
-about: Solidity documentation.
 labels: ["documentation :book:"]
 ---
 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,6 +1,5 @@
 ---
 name: Feature Request
-about: Solidity language or infrastructure feature requests.
 labels: ["feature"]
 ---