* Add code highlighter to GitHook edit

Signed-off-by: Konctantin <gawrilyako@gmail.com>

* Fix indentation

Signed-off-by: Konctantin <gawrilyako@gmail.com>

* Resolve merge conflict

Signed-off-by: gawrilyako@gmail.com <Konctantin>

* Resolve merge conflict

Signed-off-by: gawrilyako@gmail.com <Konctantin>

* Fix pre-build drone event

Signed-off-by: Konctantin <gawrilyako@gmail.com>

* update #8659 fold/unfold code diffs

* add fold button style

* update #8659 implement expand up/down codes (blob excerpt)

* fix golint errors

* fix expand direction

* remove debug message

* update css style for blob exceprt

* fix typo in comment

* update style sheet with less

* update expect diff (add SectionInfo)

* update #8942 accept suggested change (fix typo)

* close reader and check file type before get tail section

* adjust button position and check file type before insert fold button

* move index js to web_src

* merge index.js with master

* generate index.js

* update js coding style

* pack web_src/js/draw.js to public/js/index.js

* fix eslint

* modernize js and use babel

- add babel toolchain to transform modern JS to ES5
- extend eslint config for modern rules
- fixes linting issues via `eslint --fix` and manual fixes

* run 'make css' to satisfy CI

* code style tweaks and set js indendation to 2 in .editorconfig

* regenerate js

* Move index.js to web_src and use webpack

* Fix initHeatMap

* update eslint and move webpack to devDependencies

* update index.js

* add eslint env node