Support hosting under a subdirectory

[rezib]

Slurm-web should support being hosted in a subdirectory on a web server, such as https://host.ltd/slurm-web/. Documentation should also be added to showcase this capability.

Original idea from @naspert in #387

[rezib]

Please note that Rackslab needs financial support from customers to work on this task.

Slurm-web is a free software (GPLv3) without licence fee. Rackslab strongly believes in this model in which everyone can use Slurm-web regardless of their situation. However, Slurm-web development cannot happen without funding from some organizations. This is truly essential to make this software project sustainable and durable.

If your team wishes this feature to land in Slurm-web, your organization can order its development to Rackslab. You will have the opportunity to take part of its functional specifications to match your needs. This is the best way to secure its integration and delivery in the next major release. Contact us to get a quote!