Display corps birthday #391
Description
Add a cake emoji (🎂) at the end of a corps' name in CorpsDisplay if the current date is their corps-birthday. Meaning, the date of their first rehearsal or first gig (whichever is earliest).
This date is already calculated when building the text in the component (in "Gick med i corpset..."), so preferably this value should be reused in both places. Even MORE preferably the calculation should be moved out to its own function in the corps/stats router.
To keep the router function pure either the component or router API could take currentDate as an argument and use that for checking if the current date is their corps-birthday, rather than using new Date() directly in the code, as that would make the function non-pure.