Content from Mastodon statuses are not converted to plain text server
side unfortunately so it needs to be done client side.
Display messages from the Content field and run the content through the
StripHTMLTags function before printing.
This commit refactors the login flow to a GTS server thanks to an update
in the official GTS documentation.
golang.org/x/oauth2 is no longer needed.
Documentation reference:
- https://docs.gotosocial.org/en/latest/api/authentication/