2.1.21

Sync commit messages

2.1.20

Add glossary for clarification of the terminology

2.1.19

Sync double quotes

2.1.18

Translate index keywords

2.1.17

Improve code highlighting up to chapter 7

2.1.16

Improve code highlighting

2.1.15

Proofread chapter 1 and 2

2.1.14

Update pygments.rb requirement from 2.3.1 to 2.4.0 (#20)

Updates the requirements on [pygments.rb](https://github.com/pygments/pygments.rb) to permit the latest version.
- [Release notes](https://github.com/pygments/pygments.rb/releases)
- [Changelog](https://github.com/pygments/pygments.rb/blob/master/CHANGELOG.adoc)
- [Commits](https://github.com/pygments/pygments.rb/compare/v2.3.1...v2.4.0)

---
updated-dependencies:
- dependency-name: pygments.rb
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

2.1.13

Sync with upstream and enhance translations and source code

2.1.12

Update html-proofer requirement from 5.0.6 to 5.0.7 (#19)

Updates the requirements on [html-proofer](https://github.com/gjtorikian/html-proofer) to permit the latest version.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Changelog](https://github.com/gjtorikian/html-proofer/blob/main/CHANGELOG.md)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v5.0.6...v5.0.7)

---
updated-dependencies:
- dependency-name: html-proofer
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>