fix: Remove 'Create Project' button, replace with CLI prompt (#245)

For black-triangle and alpha builds, we won't be able to create projects in the UI, because they require collecting and tar'ing a set of assets associated with the project - so the CLI is going to be our entry point for creating projects.

This shifts the UI to remove the 'Create Project' button, and adds a prompt to copy a command to run.

__Before:__
<img width="1134" alt="image" src="https://user-images.githubusercontent.com/88213859/153534269-58dc95bd-0417-4bed-8e62-e2b6f479da61.png">

__After:__
![2022-02-10 19 38 01](https://user-images.githubusercontent.com/88213859/153534227-d22bd786-8c43-4858-bda6-3d9d1d614711.gif)

site/components/CodeExample/CodeExample.test.tsx

@@ -0,0 +1,15 @@
+import { screen } from "@testing-library/react"
+import { render } from "../../test_helpers"
+import React from "react"
+import { CodeExample } from "./CodeExample"
+
+describe("CodeExample", () => {
+  it("renders code", async () => {
+    // When
+    render(<CodeExample code="echo hello" />)
+
+    // Then
+    // Both lines should be rendered
+    await screen.findByText("echo hello")
+  })
+})