[breaking-change] Rearchitect for better object store compatibility.

Co-authored-by: bin <flumf@users.noreply.github.com>

config.toml.example

@@ -1,5 +1,3 @@
-data-dir = "./data"
-
 [pages]
 protocol = "tcp"
 address = ":3333"
@@ -12,3 +10,16 @@ address = ":3334"
 domain = "codeberg.page"
 clone-url = "https://codeberg.org/%s/%s.git"
 index-repo = "%s.codeberg.page"
+
+[backend]
+type = "fs"
+
+[backend.fs]
+root = "data"
+
+[backend.s3]
+endpoint = "play.min.io"
+access-key-id = "Q3AM3UQ867SPQQA43P2F"
+secret-access-key = "zuf+tfteSlswRu7BJ86wekitnifILbZam1KYY3TG"
+region = "us-east-1"
+bucket = "git-pages-demo"