[DOWNTIMES] improve ergonomics
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overing the entries in the timeline is not working very well when the over dialog is at the bottom/right of the browser window, I had to zoom out to be able to read it without problem -
https://operations-portal.egi.eu/downtimes/a/timeline: the site entities are not ordered alphabetically -
when using search engine : the timeline chart is not displayed properly -
the mechanism to register a subscription is not clear (too much actions , communication channel ...)