v30.2.0

This is a critical bug fix release including features updates.

• We fixed critical performance issues that made the web UI unusable. This include
  removing some less interesting redundant details displayed in the web UI for
  vulnerabilities.
• We made minor documentation updates.
• We re-enabled support for Arch linux, Debian, and Ubuntu security advisories importers
• We added a new improver for Oval data sources
• We improved Alpine linux and Gitlab security advisories importers

The summary of performance improvements include these fixes:

• Cascade queries from exact to approximate searches to avoid full table scans
  in all cases. This is a band-aid for now. The proper solution will likely
  require using full text search instead.
• Avoid iceberg queries with "prefetch related" to limit the number of queries
  that are needed in the UI
• Do not recreate querysets from scratch but instead allow these to be chained
  for simpler and correct code.
• Remove extra details from the vulnerability pacge: each package was further
  listing its related vulnerabilities creating an iceberg query.
• Enable the django-debug-toolbar with a setting to easily profile queries on demand
  by setting both VULNERABLECODE_DEBUG and VULNERABLECODE_DEBUG_TOOLBAR enviroment
  variables.

What's Changed

• Refactor Gitimporter using fetchcode by @ziadhany in #817
• test redhat importer performance by profiling by @ziadhany in #843
• Migrate archlinux importer by @johnmhoran in #935
• Fix gitlab importer by @TG1999 in #959
• Migrate debian-oval and ubuntu importer by @TG1999 in #740
• Make search for vulnerabilities faster by @pombredanne in #955
• Update RTD overview by @johnmhoran in #964
• Prepare release 30.2.0 by @pombredanne in #968

Full Changelog: v30.1.1...v30.2.0