Install boostrap file (css, js) using composer

[nworr]

Ticket : #

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[rldhont]

The same could be done for release_3_9 because v2.3.2 is availble too https://github.com/twbs/bootstrap/releases/tag/v2.3.2

[github-actions]

The Lizmap project highly values your contribution and would love to see this work merged! Unfortunately this PR has not had any activity in the last 2 months and is being automatically marked as "stale".
If there is no further activity on this pull request, it will be closed in two weeks.

[github-actions]

The Lizmap project highly values your contribution and would love to see this work merged! Unfortunately this PR has not had any activity in the last 2 months and is being automatically marked as "stale".
If there is no further activity on this pull request, it will be closed in two weeks.

[nworr]

The same could be done for release_3_9 because v2.3.2 is availble too https://github.com/twbs/bootstrap/releases/tag/v2.3.2

I checked the content of the package, minified version of js/css file or not included and must be build.