Make it possible to share code snippets #18

It would be really nice to just copy paste a link in order to share a code snippet online. No need for any backend storage as you can just do the same as the TypeScript playground: store the code after the hash in the URL. And the share button just copy pastes that URL.

Example TypeScript playground URL containing code: https://www.typescriptlang.org/play/?#code/GYVwdgxgLglg9mABMGAjAFGAXIsIC2qApgE4CUiA3gFCKIA2RUiA2gIYA0iqAuogLysADFwCMPANy1EAdwAWMRokwBaFRXZdeA1qi5tEAam6TpJJiBJI2UgL7VqAekeIAiiBgQA1oihEAzlD+WNQQCP5wjAB09HAA5ugoGEJkZBJ0zohCoeGRRDHxiWjooqnpiJmiOWAR0bEJSSUpaRUuAKxt1EA

The TypeScript playground uses lzstring specifically to produce a shorter URL: https://github.com/microsoft/TypeScript-website/blob/1e7ea49f60953aa446b591c6aff347a7c566e3cb/packages/sandbox/src/compilerOptions.ts#L84-L152