Add Cegedim.Cloud's vortext platform support

[pierre-lerouge]

• Add theVortext API from Cegedim.cloud as a SMS Provider : doc
• Documentation add in the administration doc
• Tested on NC 24->27

• this PR replace the messy PR Add support for Cegedim.Cloud Vortext provider #599

[vitormattos]

Thank you for your contribution and the time you put into this PR.

Since then, I’ve taken over as maintainer of this app, and it has gone through a major refactor that changed much of the internal architecture and file structure. Because of that, this PR can’t be merged in its current form.

If you’re still interested in this contribution, please feel free to rebase or open a new PR against the current main branch.

Your effort is very valuable, even if we can’t merge this directly, it helps us move the app forward. Thanks again!