VSCE: patch release v2.2.5 - update logo and add support for Gitpod

Created by: abeatrix

Close:

• https://github.com/sourcegraph/sourcegraph/issues/36477
• https://github.com/sourcegraph/sourcegraph/issues/37710
• https://github.com/sourcegraph/sourcegraph/issues/37760

This PR: Updates docs for Gitpod support.

Updates logo in the sidebar as requested by the branding team:

Test plan

See screenshots for logo update.

App preview:

• Web
• Storybook

Check out the client app preview documentation to learn more.