[Testing] Add test to BTC page

[danielsimao]

Our BTC page does not have any tests. This should the first page where we will create a more narrow test cases, meaning that there should be a test per component (the more meaningful):

• BTCOverview
• IssueForm
• RedeemForm

This test files should be added under a new folder __tests__ under the respective page.
This new approach should be considered a POC.