Added an embed mode which works via the URL, not any data in our db

[mattpocock]

Comment pasted here for ease:

/**
 * Displays a view-only page which can render a machine
 * to the canvas from the URL
 *
 * Use this example URL: http://localhost:3000/viz/view-only?machine=N4IglgdmAuYIYBsQC4QHcD2aQBoQGdo5oBTfFUTbZYAXzwhOrttqA
 *
 * This is for loading OG images quickly, and for many other applications
 * such as embedding comments in PR's parsed using xstate-parser
 *
 * To create the machine hash, use the lzString.compressToEncodedURIComponent
 * function on a JSON.stringified machine config.
 *
 * You can also use the typical embed controls
 */

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