[e.cash] Fix banner line break and anchor link margin

Summary:
The main CTA in the hero "start building" should now scroll to a better position for the section
And modified the top banner to have a nicer line break on smaller screens. The date should all wrap at once now

Test Plan: preview and check

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D18721