Configuration loader should be able to set documentation sidebar title from Hyde YAML config

[caendesilva]

# hyde.yml
name: Example

This should also affect the sidebar header

[caendesilva]

Thinking the best way to do this might be to set the environment variable? To reduce side effects it might be best to only add it if the name is only set in the Yaml config, and not in env, and that the header name is not set.

[caendesilva]

How I wish we could reference values in other config files. The following also has the same issue

Meta::property('site_name', env('SITE_NAME', 'HydePHP')),