@strypey Thanks for the heads-up, it looks like the hosting service we use is currently having difficulties.
There's a bit of incorrect information in the thread you link to btw:
Octodon wasn't using GtS before it shut down, it was using Glitch soc or some other fork of Mastodon.
GoToSocial indeed doesn't come with its own client app, but it's Mastodon-API-compatible, so most apps that work with Mastodon will work with GoToSocial (we list some of the recommended ones on every instance's "login" page -- https://gts.superseriousbusiness.org/login). GtS does have an HTML web frontend for a user's profile though, as you can see on the profile page of the official account.
Follows and followers can both be migrated to GtS (https://docs.gotosocial.org/en/v0.19.1/user_guide/migration/). There's also a separate tool called Slurp that can be used to import a Mastodon archive into GoToSocial, allowing people to functionally migrate their posts (https://docs.gotosocial.org/en/v0.19.1/user_guide/importing_posts/).