Update file structure for cody

[abeatrix]

This PR removes all the unused and outdated directories from the client/cody project as they have been integrated into the main app, and moves the VS Code extension to the base client/cody directory.

I have also updated the README.md in client/cody to reflect the changes.

All CSS files are now using relative units instead of hard-coded units. Everything should scale according to user's system.

Some minor CSS fixes.

Before	After

Before	After

Replaced placeholder logo with logo for cody:

Test plan

Run the following commands from the root of this repository in this branch:

• pnpm --filter cody run build
• pnpm --filter cody run test:unit
• pnpm --filter cody run test:integration
• pnpm --filter cody run vsce:package

Everything should work as before the move.

App preview:

• Web

Check out the client app preview documentation to learn more.

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[novoselrok]

LGTM!

I tried running the unit tests and integration tests locally, both are green. Building and running the extension locally works as well.