Cleaner urls

This release provides cleaner docs urls:

Before:

http://docat.local/#/project/0.0.0/http:%2F%2Fdocat.local%2Fdoc%2Fproject%2F0.0.0%2Finstallation%2F

Now:

http://docat.local/#/project/0.0.0/installation/

We also got rid of axios and use plain fetch.

docker run \
  --detach \
  --volume /path/to/doc:/var/docat/doc/ \
  --volume /path/to/locations:/etc/nginx/locations.d/ \
  --publish 8000:80 \
  randombenj/docat:0.0.12