Update usage.mdx (carbon-design-system#447)

src/pages/experimental/cards/usage.mdx

@@ -112,15 +112,6 @@ Content cards group related information in a single location on the page. Conten
 
 **1. Marketing, promotions, or introductions.** These are small cards used to show a product summary or functionality for the user to learn about and try. It can be used to promote other supplementary such as docs and FAQs.
 
-<Row>
-<Column colMd={8}>
-
-![Use cards for marketing or promotional material](images/marketing-example.png)
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-<Caption>Example of cards used for marketing or promotional material for catalog offerings</Caption>
-</Column>
-</Row>
-
 **2. Expandable on-boarding, learning material, or additional information.** Use cards to give a user a glimpse into a feature, or use them to preview a learning resource like best practices or other types of educational content.
 
 <Row>
@@ -139,16 +130,6 @@ Content cards group related information in a single location on the page. Conten
 
 Content cards can invite the user to start a specific process such as getting started with a new offering, launching a starter kit, or deploying a resource.
 
-<Row>
-<Column colMd={8}>
-
-![Use cards to help guide a user's first steps](images/first-step-example.png)
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-<Caption>Use cards to help guide a user's first steps</Caption>
-
-</Column>
-</Row>
-
 **4. Group blocks of related content**
 
 Cards can be used to block groups of related content even if it doesn't fit into the above models.