feat: repos with SOPS and .env files in --demo

Three repos, the first as the one lazysecrets was started in: encrypted
YAML, JSON and dotenv files, a gitignored .env, a tracked one in red and
an untracked one, with each file's details.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

cmd/lazysecrets/main.go

@@ -259,6 +259,7 @@ Flags:
 			fake.Azure(400*time.Millisecond).As("Azure:dev@example.com/demo", "Azure · dev"),
 			fake.AzureOps(700*time.Millisecond).As("Azure:ops@example.com/demo", "Azure · ops"),
 			fake.Databricks(600 * time.Millisecond),
+			fake.Repos(),
 		}
 	} else {
 		pc := cfg.Providers