Summary: Shipper adds cost comparison tool

Why It Matters: This change helps users see how much money they can save.

What Changed:

• Removed "Thank you! Your submission has been received!" and "Oops! Something went wrong while submitting the form." messages from the top of the page.
• Added a "Play with a demo" link under "Use The Advisor" section.
• Added a new section called "Shipper.now·Pricing comparison" with a tool to compare developer costs versus Shipper credits. This section includes:
  • A calculator for developer team size and location.
  • A description of "The Advisor" and its role.
  • A cost breakdown showing developer salaries versus Shipper plan costs and monthly savings.
  • A visual comparison of costs.
  • A note about editable assumptions.