fix #249 header 2 (#425)

* Header updates
* More pixel alignment for nav
* Update unit test snapshots
I removed a stray `,` from `testHelpers.tsx` which changed the output of several snapshots.
* Fixes from PR review
* Forgot to update snapshots after merge with main
* Removed unused (and outdated) timeline page
* Updated some translation descriptions.

client/src/components/__snapshots__/mapInfoPanel.test.tsx.snap

@@ -26,6 +26,5 @@ exports[`simulate app starting up, no click on map should match the snapshot of
       </div>
     </aside>
   </div>
-  ,
 </DocumentFragment>
 `;