Update CONTRIBUTING.md

Added new issue sorting logic
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Update CONTRIBUTING.md
Update CONTRIBUTING.md

Updated finding an issue to work on
Issue #416 - Clear search when filter is activated.
add link underline and hover to yellow
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@karlcow to move this - design documentation
Issue #416 - Disable filter buttons when search happens.
Issues #416 - Tests for filter/search interaction
Issue #416 - Fix semicolon error; consistent single quotes.
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Moving design doc to design repo
Issue #419 - Add User Agent header to form body
Issue #419 - Hide @ua_header metadata from frontend
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Merge pull request #441 from webcompat/issues/419/1

Fix #419 - Add user agent header as metadata
Issue #404 - Use type=url for bug reporting form (with no validation)
v1.1.0 changelog update.
Update to privacy policy.
v1.1.1 update.
Merge pull request #440 from webcompat/issues/416/1

Fixes #416 - interaction between search & filter