Escrow balance redesign and other clean ups

Resolves #1193 

This PR includes:
- polished sidebar
- display escrow balance to the payments page
- set cookies to show new updates modal once per user

Known issues:
- [x] Orders page header should update
- [x] Escrow balance dropdown should open its own menu instead of date picker
- [ ] Search icon should turn black on focus
- [ ] Withdraw funds dialog takes a long time to open