[SG-35180] Accessibility: Screen reader navigation for notebooks

Created by: gitstart-sourcegraph

Audit type

Screen reader navigation

User journey audit issue[

#34197 (closed)](https://github.com/sourcegraph/sourcegraph/issues/34197)

Problem description

On the notebook edit page:

• The edit button should announce what it does.

Refs

SourceGraph Issue GitStart Issue

Test Plan

https://www.loom.com/share/e9ac078cf6fa497c85f035c4eb94ed9d

ET

1 hour

App preview:

• Web
• Storybook

Check out the client app preview documentation to learn more.