Docs - add how use custom disk

[StephaneBour]

Hello,

I use a particular filesystem for images (https://github.com/sausin/laravel-ovh), and I needed to change the default disk.

I spent some time figuring out how to do this, so I completed the documentation for that.

Thank you.

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Name	Status	Preview	Comments	Updated (UTC)
lunar-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 12, 2024 7:07pm

[StephaneBour]

I updated based on @wychoong 's comments, but I'm not supportive of these changes at now.

[glennjacobs]

Thanks @StephaneBour