fix join-page to reflect free membership better

Author: aiviaghost

join.md

@@ -8,15 +8,12 @@ id: join
 # Join
 
 Our by-laws can be found at [github](https://github.com/Code-at-LTH/meta).
-Membership is valid for one year, costs 20 SEK and requires Swish.
+Membership is valid for one year.
 
 To join and support Code@LTH you need to do the following:
 
 - Go to [our site at Unga Forskares membership system](https://ebas.ungaforskare.se/signups/index/62).
 - Fill in the form.
-- Swish 20 kr to us, the number can be found at the form.
 - Optional: request to receive a Code@LTH sticker for your laptop.
 
-We will use this money to buy fika and prizes for our events.
-
 If you'd like to cancel your membership, and get removed from our membership database, please [contact us](/about/).