Release v0.13.0

What's Changed

• fix(policies): align category grouping JSON with Airtable by @elsapet in #197
• feat: policy for insecure HTTP GET by @didroe in #199
• fix: fix datatype docs by @elsapet in #198
• docs: theme updates and policy docs by @markmichon in #195
• docs: update contributing instructions by @markmichon in #201
• fix: sort risk locations in a consistent order by @didroe in #202
• fix: Detect Net::FTP.open in Ruby custom detector by @spdawson in #200

Full Changelog: v0.12.0...v0.13.0