sh: Switch from sfz to miniserve in serve alias

Serve alias (now also with a more appropriately named file) will now
look for miniserve before any other static file serve program. I also
replaced sfz with miniserve in my installed programs. That is because
sfz has been unmaintained for a long time and miniserve completely
fulfills all my needs while still being maintained and recommended.

sh/.config/sh/alias.d/serve.sh

@@ -2,7 +2,9 @@
 ## Quickly bring up a file server for
 #  the current directory.
 
-if exist sfz; then
+if exist miniserve; then
+	alias serve="miniserve"
+elif exist sfz; then
 	alias serve="sfz"
 elif exist gossa; then
 	alias serve="gossa"