It is possible to run Soapbox as your main frontend on top of Mastodon. This will replace the homepage and all static pages with Soapbox, using Mastodon only as the API.
To do so, shell into your server and unpack Soapbox:
mkdir -p /opt/soapbox
curl -L https://gitlab.com/soapbox-pub/soapbox-fe/-/jobs/artifacts/develop/download?job=build-production -o soapbox-fe.zip
busybox unzip soapbox-fe.zip -o -d /opt/soapbox
Now create an Nginx file for Soapbox with Mastodon. If you already have one, replace it:
curl https://gitlab.com/soapbox-pub/soapbox-fe/-/raw/develop/installation/mastodon.conf > /etc/nginx/sites-available/mastodon
Edit this file and replace all occurrences of example.com
with your domain name.
Uncomment the SSL lines if you've enabled SSL, otherwise do that first.
Finally, ensure the file is symlinked, then restart Nginx:
ln -s /etc/nginx/sites-available/mastodon /etc/nginx/sites-enabled/mastodon
systemctl restart nginx
If all is well, hopefully this worked!
If not, run nginx -t
to see if anything is amiss, and try reviewing Mastodon's install guide.