Print open home-gitops issues on the Epson receipt printer

Reads a Gitea API token from .gitea_token (gitignored, not present yet --
needs creating on the server), fetches open issues via the API, and prints
number/title/labels per issue with a running total. Button on the home page.

.gitignore

@@ -1,4 +1,5 @@
 .session_secret
+.gitea_token
 public/files/*
 !public/files/.gitkeep
 data/labels/*