Yes! Exactly that.
On my end as well I was setting it up as root, which I thought could be one of the issues.
I think I've found the issue. It's because the files don't exist in the destination configured here: https://github.com/bitvora/wot-relay/blob/master/docker-compose.yml#L11 And these paths are defined in the .env: https://github.com/bitvora/wot-relay/blob/master/.env.example#L13 which are loaded / used in the Go binary. So what is described that you only should edit the left side before the colon is incorrect? So '- "./templates/index.html:/app/templates/index.html"' should be the same as the INDEX_PATH value in the .env. The same logic applies for the STATIC_PATH.
So "./templates/index.html:/app/templates/index.html" would become "./templates/index.html:<SET_THE_SAME_INDEX_PATH_AS_DEFINED_IN_THE_ENV_FILE>"