Sync the self-hosting stack (85835b7)

.gitattributes

@@ -6,3 +6,8 @@
 # the connection, or as a vault that cannot decrypt what it wrote yesterday, with nothing anywhere
 # naming a line ending as the cause.
 * text=auto eol=lf
+
+# And the screenshots are bytes, not text. `text=auto` above already detects that correctly, but
+# saying so costs one line and removes the question before somebody adds a JPEG.
+*.png binary
+*.jpg binary