integration test - website upload with multiple sub directories

[istae]

we need to create a new integration that:

1. uploads a whole directory with a root index.html and multiple sub-paths.
2. fetches the reference so that index.html is returned, and fetches all sub directories
3. updates the directory a couples of times with some new files.
4. fetches the reference and all new sub directories.

see https://docs.ethswarm.org/docs/develop/access-the-swarm/upload-and-download for inspiration
for example:

my_website
├── assets
│   └── style.css
              └── images
                      └── image1.png
├── index.html
└── error.html

we already have "manifest" integration test, maybe we can extend the already existing test to include the above.