[openstreetmap/openstreetmap-website] Improve visibility of element navigation by moving it above content (PR #6865)

[Arpan Mukherjee]

Arpan200502 left a comment (openstreetmap/openstreetmap-website#6865)

@pablobm 
### Update

Rebased the branch on the latest `master` and cleaned up the commit history.

While resolving earlier conflicts and CI issues, an incorrect reset accidentally introduced unrelated upstream changes into the branch. The branch has now been reset to the intended commit and force-pushed so the PR only contains the relevant modifications.

### Changes in this PR

* Move the element navigation `<nav>` block above the element content in the sidebar.
* Apply Bootstrap utility classes (`sticky-top`, `bg-body`, `border-bottom`, `pb-2`, `z-1`) so the navigation remains visible while scrolling.
* Apply the same layout adjustment to the corresponding **history/version views** to keep behavior consistent.
* Minor ERB lint cleanup (trailing newline).

### Result

* Navigation is visible immediately below the sidebar header.
* Navigation remains accessible when scrolling long tag lists or version histories.
* Commit history is now a single clean commit rebased on the latest `master`.
* All checks are passing.


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