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* Removed unused (and outdated) timeline page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__/J40Footer.spec.tsx.snap

@@ -164,6 +164,5 @@ exports[`J40Footer renders correctly 1`] = `
       </div>
     </div>
   </footer>
-  ,
 </DocumentFragment>
 `;