Docs: Add analytics

[louismaximepiton]

Note: Please transform - [ ] into - (NA) in the description when things are not applicable

Related issues

Closes #130.
Closes #15.

Description

• Added the cookies management using TarteAuCitron
• Added the custom scripts and custom CSS

Should we add a page to manage cookies ? If yes where is the link to it ?
It's quite dirty rn, since it's pure html. The example part is hardcoded but the api part is implemented via build/tarteaucitron.html which is minified. Should it be unminifed ?

Motivation & Context

Make sure the analytics are made somewhere.

Types of change

• New feature (non-breaking change which adds functionality)

Test checklist

Please check that the following tests projects are still working:

• docs/examples
• test/angular-ngx-echarts
• test/angular-echarts
• test/html
• test/react
• test/vue
• test/examples/bar-line-chart
• test/examples/single-line-chart
• test/examples/timeseries-chart

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[julien-deramond]

Should we add a page to manage cookies ? If yes where is the link to it ?

We should, but for that we'd probably need to integrate a footer. I let you create another issue to tackle it later on.

[julien-deramond]

LGTM!