Allow sharing of links to generated startups

[jpdillingham]

Users should be able to generate a link to a generated startup so others can see it.

This could be as simple as base64 encoding the startup and the noun and including it in the URL. This might go well with #51.

[jpdillingham]

Duplicate of #45. Leaving both open.

[abhishekpatil4]

@jpdillingham Can I work on this issue?

[jpdillingham]

Absolutely!