[Docs] Update Engine Pricing

[saminacodes]

CORE-0000

---

PR-Codex overview

This PR updates the pricing information in the page.mdx file for Engine Cloud, clarifying the calculation of costs and modifying the legacy pricing note.

Detailed summary

• Updated the pricing calculation to include sign requests alongside write requests.
• Clarified that both write and sign requests cost $1 per 1,000 requests.
• Revised the note about legacy pricing plans to specify a 10% fee when signed up instead of 5%, with a link to the pricing page.

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Name	Status	Preview	Comments	Updated (UTC)
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.28%. Comparing base (bfdac10) to head (713ebe0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7080   +/-   ##
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  Coverage   55.28%   55.28%           
=======================================
  Files         904      904           
  Lines       58499    58499           
  Branches     4069     4069           
=======================================
  Hits        32343    32343           
  Misses      26051    26051           
  Partials      105      105           

Flag	Coverage Δ
packages	55.28% <ø> (ø)

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[github-actions]

size-limit report 📦

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thirdweb (esm)	56.29 KB (0%)	1.2 s (0%)	195 ms (+163.34% 🔺)	1.4 s
thirdweb (cjs)	304.46 KB (0%)	6.1 s (0%)	600 ms (+12.07% 🔺)	6.7 s
thirdweb (minimal + tree-shaking)	5.69 KB (0%)	114 ms (0%)	55 ms (+607.65% 🔺)	169 ms
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thirdweb/react (minimal + tree-shaking)	19.51 KB (0%)	391 ms (0%)	76 ms (+479.17% 🔺)	466 ms

[saminacodes]

Merge activity

• May 19, 11:42 AM EDT: The merge label 'merge-queue' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• May 19, 11:50 AM EDT: saminacodes added this pull request to the Graphite merge queue.
• May 19, 11:54 AM EDT: Merged by the Graphite merge queue.