[Portal] fee-changes (#6573)

CORE-0000

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---

## PR-Codex overview
This PR focuses on updating the fee structure and related information for the `Buy With Crypto` and swap transactions in the `fee-sharing` documentation.

### Detailed summary
- Removed references to a 1% fee and 70% sharing for `Buy With Crypto`.
- Updated the protocol fee to 0.3% for swap transactions.
- Allowed developers to set their own additional fees.
- Clarified fee structure for buying with crypto and swap transactions.

> ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your question}`

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Author: saminacodes

apps/dashboard/src/components/pay/PayConfig.tsx

@@ -139,9 +139,8 @@ export const PayConfig: React.FC<PayConfigProps> = (props) => {
               Fee Sharing
             </h3>
             <p className="mt-1.5 mb-4 text-foreground text-sm">
-              thirdweb collects a 1% fee per end user transaction through{" "}
-              <strong>Buy With Crypto</strong>. We share 70% of this fee with
-              you.{" "}
+              thirdweb collects a 0.3% protocol fee on swap transactions. You
+              may set your own developer fee in addition to this fee.
               <Link
                 href="https://portal.thirdweb.com/connect/pay/fee-sharing"
                 target="_blank"

apps/portal/src/app/connect/pay/faqs/page.mdx

@@ -16,11 +16,7 @@ thirdweb does not charge any fees for buy with fiat. Any fees on onramping are b
 </Details>
 
 <Details summary="What are the fees for Buy With Crypto?"> 
-For buying with crypto, thirdweb charges 0.3% and the application developer may charge up to 0.7% on each transaction
-</Details>
-
-<Details summary="How does fee sharing work for Buy With Crypto?"> 
-thirdweb shares 70% of all fees collected through Buy With Crypto with our developers. Fee sharing is not currently available for Buy With Fiat transactions.
+For buying with crypto or swap fees, thirdweb charges a 0.3% protocol fee. Developers may monetize their application by charging additional fees set through the dashboard.
 </Details>
 
 <Details summary="What does the term “network fees” refer to?">