* Fix double scroll in branch dropdown

* Revert of 425ae38aa9

* Changes in .less, generated new .css

* Revert unnecessary commented line

- moved gitgraph.js to web_src and made it importable and es6-compatible
- created new webpack chunk for gitgraph
- enabled CSS loader in webpack
- enabled async/await syntax via regenerator-runtime
- added script to ensure webpack chunks are loaded correctly
- disable terser's comment extraction to prevent .LICENCE files

gitgraph.js has many issues:

1. it is incompatible with ES6 because of strict-mode violations
1. it does not export anything
1. it's css has weird styles like for `body`
1. it is not available on npm

I fixed points 1-3 in our version so it's now loadable in webpack. We should eventually consider alternatives.

* Add add 'write' 'preview' buttons to wiki edit like in issues

affects #6975

Signed-off-by: Michael Gnehr <michael@gnehr.de>

* update dark theme

Signed-off-by: Michael Gnehr <michael@gnehr.de>

* fix css lint warnings - missing spaces

Signed-off-by: Michael Gnehr <michael@gnehr.de>

* hide preview button on no fullscreen toolbar

Signed-off-by: Michael Gnehr <michael@gnehr.de>

* wiki - enable side-by-side button in editor

and add some delay so side-by-side live preview is updated
* every 10th keypress
* if keypress < 10 -> apter no input for 1 sec

affects #5436


Signed-off-by: Michael Gnehr <michael@gnehr.de>

* decrease timeinterval user need to stop before rendering is triggered

Signed-off-by: Michael Gnehr <michael@gnehr.de>

* removed not needed code with simpleMDE placeholder

Signed-off-by: Michael Gnehr <michael@gnehr.de>

* run highlight.js on markdown preview

Signed-off-by: Michael Gnehr <michael@gnehr.de>

* fix white border around side-by-side preview

Signed-off-by: Michael Gnehr <michael@gnehr.de>

Modify display of reactions to issues to remove spaces and make them
feel more apart of the reactions bar rather than separate items within.

* 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