CE-1864: use common Help page

Closes CE-1864

requested review from @alexandermadsen, @domonkosgulyas, @imretoth, and @simonrose

assigned to @christinajenks

Existing help content was moved into Confluence and is described specifically on the linked ticket CE-1864

added 3 commits

• f55d3748...52f9e85c - 2 commits from branch develop
• da5e5588 - CE-1864: resolve upstream conflicts

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added 1 commit

• 60048e6d - CE-1864: remove commented out code

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approved this merge request

mentioned in commit 58861173

merged