Features
- Add pigeon ([1712](https://github.com/ocadotechnology/rapid-router/pull/1712),
[`5c7029b`](https://github.com/ocadotechnology/rapid-router/commit/5c7029b965a124faa7d593d0f9997729de98b192))
* add pigeon sounds
* add pigeon sound and image
* switch between animals on theme switch, rotate pigeon
* update pigeon sound and cow group type
* write pigeon test, address pigeon edge case
* change descriptions to be more general
* modify test slightly
* add line to test that I forgot
* add line to test to wait for element
* use xpath instead of css_selector
* get rid of unnecessary check
* fix typo
* test out adding delay to test
* check that cow is there
* test the test
* test if xpath works at all in this case
* switch back to using css_selector
* test out a small change to the test
* undo small change, run black
* Install latest portal
* address PR comments - dynamically change cows block
* continue work on dynamic pigeon block
* make pigeon block dynamic
* tidy up, add pigeon translations
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Co-authored-by: Florian Aucomte <f.aucomtehotmail.co.uk>