Improve github issue template (#162)

- Simplify the user by opening an issue (giving direction)
- Mark issue label
- Markdown lint

Signed-off-by: Avelino <t@avelino.xxx>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: Bug Report
 about: Report problems and unexpected behavior.
 title: ''
-labels: ''
+labels: 'bug'
 assignees: ''
 ---
 
@@ -12,7 +12,11 @@ assignees: ''
 - `code-server` version: <!-- The version of code-server -->
 - OS Version: <!-- OS version, cloud provider,  -->
 
-#### Steps to Reproduce
+## Description
 
-1.
-2.
+<!-- Describes the problem here -->
+
+## Steps to Reproduce
+
+1. <!-- step 1: click ... -->
+1. <!-- step 2: ... -->

.github/ISSUE_TEMPLATE/extension_bug.md

@@ -12,7 +12,11 @@ assignees: ''
 - OS Version: <!-- OS version, cloud provider,  -->
 - Extension: <!-- Link to extension -->
 
-#### Steps to Reproduce
+## Description
 
-1.
-2.
+<!-- Describes the problem here -->
+
+## Steps to Reproduce
+
+1. <!-- step 1: click ... -->
+1. <!-- step 2: ... -->

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,7 +2,7 @@
 name: Feature Request
 about: Suggest an idea for this project.
 title: ''
-labels: ''
+labels: 'feature'
 assignees: ''
 ---
 

.github/ISSUE_TEMPLATE/question.md

@@ -2,16 +2,16 @@
 name: Question
 about: Ask a question.
 title: ''
-labels: ''
+labels: 'question'
 assignees: ''
 ---
 
 <!-- Please search existing issues to avoid creating duplicates. -->
 
-#### Description
+## Description
 
 <!-- A description of the the question. -->
 
-#### Related Issues
+## Related Issues
 
 <!-- Any issues related to your question. -->