1. Change the paragraph headings to proper Markdown headings (easier to
link / structure the Markdown)
2. Move PULL_REQUEST_TEMPLATE into .github folder
3. Change description in Issue template and remove outdated DevGuide
Repository information
4. Add a bug emoji to bug report isue template
5. Support automatically adding labels 'bug-report' and
'feature-request' to easily sort / filter appropriate issues in Github