[x] The "Min. 100 tokens" message don't disappears when the amount is >100.
[x] When the admin has logged with Social auth, a "flash" message appears after returning from the Stirpe page:
[ ] When the admin has logged with Social auth, the returning page is totally blank, we should add a loader with a "Processing..." text.
[x] After a successful purchase, we should guide our users to the "Create Process" with a button:
Add a text underneath with "Create your voting process now or access to your Dashboard".
[x] If the cost is "0" the button should not be clickable or be able to buy "0" tokens.