v0.2.6 release

Bump @primer/css from 12.3.1 to 12.6.0

[Security] Bump lodash from 4.17.11 to 4.17.15

Bump stylelint-config-primer from 7.0.0 to 7.0.1

Bump stylelint from 10.0.1 to 10.1.0

Search improvement branch

Content footer

Bumps [@primer/css](https://github.com/primer/css) from 12.3.1 to 12.6.0.
- [Release notes](https://github.com/primer/css/releases)
- [Changelog](https://github.com/primer/css/blob/master/CHANGELOG.md)
- [Commits](https://github.com/primer/css/compare/v12.3.1...v12.6.0

)

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