Option to generate all lowercase filenames and folders to have simpler slugs

[runofthemillgeek]

Is your feature request related to a problem? Please describe.
I'd like the filenames and folders generated to be all lowercase so that it's easier to have a web server host them and get lowercase slugs by default without having to add extra config code to web server/reverse proxy or some script to transform content before being copied over to Quartz.

Describe the solution you'd like
A property like slug.casing in QuartzConfig which can be set to "default" or "lowercase".

Describe alternatives you've considered

1. A script that converts all file/folders of my rsync-ed Obsidian vault in content/ dir before running npx quartz build. I'm not sure about the complexity here since the links inside notes would still be using mixed cases from my Obsidian Vault.
2. Writing custom code/config for my reverse proxy to parse the public/ tree and map incoming requests correctly
3. A plugin for this but I'm not so sure since plugins come much after slugification
4. Just live with mixed cases in paths

Additional context
IMHO, it's easier to stick to all lowercase URLs than mixed URLs which will lead to 404s if someone gets a letter casing wrong while sharing links. It also helps to preserve future refactors of the source content (Obsidian vault in my case) since people like myself would prefer to keep natural casing for my notes vs the site I'll be publishing.

Can help contribute if this sounds good.

[donovanglover]

Related: #1039