Collective.plausible

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- Nothing changed yet.

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- Fix : action names
[remdub]

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- Refactor : collective.plausible is now based on a behavior
[remdub]

- Add viewlet to insert plausible tracking code in the page
[remdub]

- Refactor : server healthcheck is now a separate view plausible-healthcheck
[remdub]

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- Add plausible server healthcheck into plausible control panel
[remdub]

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- Add an optional link to statistics browserview in user menu
[remdub]

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- Rename package to collective.plausible
[remdub]