* Rename v9 highlight.js plugin to highlight-legacy
* Add ES6 version of highlight.js plugin
* highlightblock.js
- ensure this ES6 plugin will not cause error on legacy browsers
- update the code to use new highlight.js APIs
- change class tagging to match more closely with highlight.js
- allow users to add language definitions as JS "highlight" modules
* styles.tid
- update to match v11
* howto.tid
- add instructions on how to add language definitions as JS modules
* highlight.min.js, default.min.css
- version 11.4.0 common languages only
* Remove extraneous whitespaces
* Update readme.tid
* Update bundled languages
bundled: common + apache + nginx + latex + dockerfile + fortran
* Update highlight-legacy subtiddlers' titles
* Touch up highlight-legacy docs
* Touch up highlight plugin docs
* Fix pre block styling
- add "hljs" class to <pre> so the element can be styled
