* Add mermaid JS renderer

For feature parity with GitLab. Tested in files, issues, wiki, editor.
arc-green only does an inversion because the renderer seems to like to
render white backgrounds on boxes.

Ref: https://github.com/go-gitea/gitea/issues/3340
Fixes: https://github.com/go-gitea/gitea/issues/12307

* add feature entry, switch to neutral theme, remove border

* add bindFunctions support

* remove unnecessary border-radius

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

Introduce 'make svg' which calls a node script that compiles svg files
to `public/img/svg`. These files are vendored to not create a dependency
on Node for the backend build.

On the frontend side, configure webpack using `raw-loader` so SVGs can
be imported as string.

Also moved our existing SVGs to web_src/svg for consistency.

Fixes: https://github.com/go-gitea/gitea/issues/11618

* Move tributejs to npm/webpack

- Move vendored bundle to npm and webpack
- Rewrote initialization to single function
- Restyled it (made it a bit smaller)
- Fixed it for arc-green

* fix mention

* also include emoji on #content

* Update web_src/less/_tribute.less

Co-authored-by: mrsdizzie <info@mrsdizzie.com>

* rewrite to only use one instance of Tribute

* refactor

* fix copy/paste error

Co-authored-by: mrsdizzie <info@mrsdizzie.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Switch code editor to Monaco

This switches out CodeMirror for Monaco which is based on the same code
base as VS code and should work pretty similar to it.

It does add a few async chunks, totalling around 10MB to our build. It
currently supports around 65 languages and in the default configuration,
each language would emit one ugly [number].js chunk, so I opted to
combine them all into a single file for now.

CodeMirror is still being used under the hood by SimpleMDE so it can not
be removed yet.

* inline editorconfig, fix diff, use for markdown, remove more dead code

* refactors, remove jquery usage

* use tab_width

* fix intellisense

* rename function for clarity

* misc tweaks, enable webpack progress display

* only use --progress on dev build

* remove useless borders in arc-green

* fix typo

* remove obsolete comment

* small refactor

* fix file creation and various refactors

* unset useTabStops too when no editorconfig

* small refactor

* disable webpack's [big] warnings

* remove useless await

* fix dark theme check

* rename chunk to 'monaco'

* add to .gitignore and delete webpack dest before build

* increase editor height

* support more editorconfig properties

* remove empty element filter

* rename

Co-authored-by: John Olheiser <john.olheiser@gmail.com>

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* SVG fixes

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Colorize span->svg only

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* @silverwind suggestions

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Alphabetical

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Convert suburl and staticPrefix to window.config

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* De-structure

Signed-off-by: jolheiser <john.olheiser@gmail.com>

Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>