Add C8 header to Optimize 7 docs

[mboskamp]

Acceptance Criteria (Required on creation)

At docs.camunda.org/optimize/latest there is a similar header linking to C8 as for docs.camunda.org/manual/latest

Hints

• We need to add the header to all supported branches:
  • master
  • latest
  • 3.14
  • 3.13
  • 3.12
  • 3.11

Links

Breakdown

Pull Requests

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1. https://github.com/camunda/camunda-docs-optimize/pull/352
2. https://github.com/camunda/camunda-docs-optimize/pull/353
3. https://github.com/camunda/camunda-docs-optimize/pull/354
4. https://github.com/camunda/camunda-docs-optimize/pull/355
5. https://github.com/camunda/camunda-docs-optimize/pull/356
6. https://github.com/camunda/camunda-docs-optimize/pull/357

[mboskamp]

Maybe latest is not necessary. We will release 3.14 as latest when the content is final. So I guess, we can ignore this branch for now.

[mboskamp]

All merged and the changes are visible on stage.