add tmp dynamic pricing table image and update gas and fees doc

docs/how-arbitrum-works/deep-dives/gas-and-fees.mdx

@@ -7,6 +7,8 @@ user_story: As a current or prospective Arbitrum user, I need to learn more abou
 content_type: get-started
 ---
 
+import ImageZoom from '@site/src/components/ImageZoom';
+
 Gas is used by <a data-quicklook-from="arbitrum">Arbitrum</a> to track the cost of execution on a Nitro chain. It works the same as Ethereum gas, in the sense that every EVM instruction costs the same amount of gas that it would on Ethereum.
 
 There are two parties a user pays when submitting a transaction:
@@ -78,6 +80,8 @@ The algorithm tracks a gas backlog for each target. Whenever a transaction consu
 
 This layered structure creates a dampening effect: overlapping windows smooth volatility at their respective timescales, reducing peak gas prices during congestion while preserving responsiveness to genuine capacity constraints.
 
+<ImageZoom src="/img/dynamic-pricing-table.png" alt="dynamic pricing table" className="img-600px" />
+
 For more details on how gas targets affect chain security and validator assumptions, see [the gas target](#the-gas-target) section below.
 
 ### Child chain Tips