feat(build): delete gulp v3 and replace by scripts tasks

[samuel-gomez-axa]

#621 : All builded css for packages are generated by Gulp tasks but the version of Gulp is not compatible with node 12

Person(s) for reviewing proposed changes : @guillaumechervetaxa

Solution : replace all tasks with vanilla scripts and remove Gulp v3

• delete gulpfile.js
• delete Gulp tasks from ./scripts/tasks/*
• create style.js in ./scripts that replace all gulp tasks
• create clean.js in ./scripts for clean all ./dist packages

I also deleted several tasks :

• bootstrap-theme (boostrap bundle)
• split-bootstrap-component-universes (splitted bootstrap components themed by universes)
• split-bootstrap-component (splitted bootstrap components)
• universe-bundle (generate af-toolkit-core themed by universes)
• svgstore (generation of svg sprite with icons) ⁽¹⁾
• iconfont (generation of icon font glyphicon) ⁽¹⁾
• clean (delete all /dist packages)
• cleanlock (delete package-lock)
• generatelock (generate package-lock)

⁽¹⁾ Theses tasks generated the icon font files and the sprite for icons.

but i would like to create icons React Components instead in next PR.
So i copy theses generates files in legacy directory sources and just copy it in /dist for non breaking changes

The Design System Website has already updated like SVG React components .

Finally, i deleted the storybook/styles because its unused.

[xballoy]

Can we fix this warning when we run style.js:

Build style packages   Starting 
Without `from` option PostCSS could generate wrong source map and will not find Browserslist config. Set it to CSS file path or to `undefined` to prevent this warning.
Build style packages   Finished 

[samuel-gomez-axa]

@xballoy , i fixed the postcss warning an the browserlist warning.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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[xballoy]

LGTM

[arnaudforaison]

Pourquoi des width en px ? Suppression de gulp ?

[samuel-gomez-axa]

oui, c'est surtout le fait d'avoir supprimer les tasks pour la génération des font icons. J'ai anticipé le CSS qui permettra d'avoir des composants React SVG pour l'utilisation des icons avec le toolkit.

[samuel-gomez-axa]

tout en faisant attention de ne pas avoir de breaking change avec ceux qui utilisent les font icons ;)