Add Magic Quadrant section to various sourcegraph.com pages

[kelvinyap]

Figma file: https://www.figma.com/design/fQOutjRX34LcNGOGJyZsiI/Gartner-MQ-2024-web-updates?node-id=0-1&m=dev&focus-id=42-5784

We want to add a section that mentions the Gartner Magic Quadrant on the following pages:

• sourcegraph.com
• sourcegraph.com/cody
• sourcegraph.com/demo/cody
• sourcegraph.com/enterprise

The link for each should go to: sourcegraph.com/resources/gartner-mq (this URL will be created with work over in this issue)

[gitstart-app[bot]]

Here is the GitStart Ticket for this issue: https://clients.gitstart.com/sourcegraph/3436/tickets/SGM-7153