Update nav.html for handling nav_exclude

Fix duplicated title and description tags

v0.2.8

bugfix in search.rake

Update rake requirement from ~> 12.3.1 to >= 12.3.1, < 13.1.0

Bump stylelint-config-primer from 8.0.0 to 9.0.0

Update bundler requirement from ~> 2.0.1 to ~> 2.1.4

Updates the requirements on [bundler](https://github.com/bundler/bundler) to permit the latest version.
- [Release notes](https://github.com/bundler/bundler/releases)
- [Changelog](https://github.com/bundler/bundler/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bundler/bundler/compare/v2.0.1...v2.1.4

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump @primer/css from 12.7.0 to 14.3.0

Update jekyll requirement from ~> 3.8.5 to >= 3.8.5, < 4.1.0

Create config.yml

Bumps [@primer/css](https://github.com/primer/css) from 12.7.0 to 14.3.0.
- [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/v12.7.0...v14.3.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Currently just-the-docs renders two title and description tags
when used with jekyll-seo-tag. This patch fixes plugin detection
conditonal.

It appears nav_exclude only works on top level navigation items. I needed it to work at the child level as well. I believe these changes accomplish that for the child and grand_child levels.

Love this theme. I've used it a few times. Apologies if this pull request is not according to convention. This is the first time I've done it on someone else's code. Thanks!

Bumps [stylelint-config-primer](https://github.com/primer/stylelint-config-primer) from 8.0.0 to 9.0.0.
- [Release notes](https://github.com/primer/stylelint-config-primer/releases)
- [Changelog](https://github.com/primer/stylelint-config-primer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/primer/stylelint-config-primer/compare/v8.0.0...v9.0.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Updates the requirements on [rake](https://github.com/ruby/rake) to permit the latest version.
- [Release notes](https://github.com/ruby/rake/releases)
- [Changelog](https://github.com/ruby/rake/blob/master/History.rdoc)
- [Commits](https://github.com/ruby/rake/compare/v12.3.1...v13.0.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

duplicated from fix #80 
the same error in Version 2.0.7
fix with same procedure

Updates the requirements on [jekyll](https://github.com/jekyll/jekyll) to permit the latest version.
- [Release notes](https://github.com/jekyll/jekyll/releases)
- [Changelog](https://github.com/jekyll/jekyll/blob/master/History.markdown)
- [Commits](https://github.com/jekyll/jekyll/compare/v3.8.5...v4.0.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

v0.2.7 release