[Bexley] Add link to address lookup page to waste navbar.

[neprune]

[skip changelog]

closes https://github.com/mysociety/societyworks/issues/4406

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.93%. Comparing base (ce80472) to head (356b5a7). Report is 8 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5054 +/- ## ========================================== + Coverage 82.65% 82.93% +0.27% ========================================== Files 396 396 Lines 30828 31876 +1048 Branches 4890 4894 +4 ========================================== + Hits 25482 26437 +955 - Misses 3900 3993 +93 Partials 1446 1446 ```

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[nephila-nacrea]

Merged to staging.