Use mkcert instead of Server Side Up CA for local certificates

[yusufkandemir]

As per https://github.com/serversideup/spin-template-laravel-basic#trusted-ssl-certificates-in-development, this template ships certificates that require Server Side Up CA.

I propose using mkcert to generate the certificates locally. That will eliminate the need to trust a remote CA.

I know this is already possible by doing it manually.

Here are possible approaches:

• Detect if mkdist is installed. If it is, then use it to generate certificates automatically.
• Prompt the user with two options: use ssup CA or use mkcert
• Add a tip to the README, letting the users know that they can use mkdist if they want to generate certificates themselves.

[jaydrogers]

This might require some pretty deep thought to nail the UX on this. I am going to leave this open and welcome other comments on any suggestions as well.

I am all for not using the SSU CA, but I feel like I haven't come across the perfect solution yet (same with local DNS).