Exemplary run scripts fail

Hi there,

while doing the review for JOSS (https://github.com/openjournals/joss-reviews/issues/10439) I checked out this template repository and tried to run some of the runscripts. I'm not exactly sure what the expectation management here is, so I will consider that they should run after a fresh clone and `make install` - otherwise it's something to document.

The two HPO scripts cannot run due to bad paths (`mighty_domain_randomization`).
The multiple seeds script fails on a missing dependency:

```bash
(mighty_project_template) janik@Mac mighty_project_template % ./runscripts/run_multiple_seeds.sh
Traceback (most recent call last):
File "/Users/janik/source/mighty_project_template/mighty_project/run_mighty.py", line 8, in
import minigrid # noqa: F401
^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'minigrid'
```

I don't think this is a blocking issue for the JOSS review, but since it's linked in PyPi I stumbled over it 🙂

Start with make install and run the two HPO scripts plus runscripts/run_multiple_seeds.sh. Check the HPO scripts' mighty_domain_randomization paths and the missing minigrid dependency reported from mighty_project/run_mighty.py. Done means the scripts run after a fresh clone and make install, or their prerequisites and limitations are documented.

Written by the indexing model from the issue text.