Fix code blocks in spartan wiki page

spartan.md

@@ -67,27 +67,22 @@ preventing someone else from overwriting your files, with their scripts!
 you can also check for the user's input. for example, you your `index.gmi` you
 can have a input prompt:
 
-```gmi
-=: echo.sh send some input
-```
+
+    =: echo.sh send some input
 
 then in `echo.sh`:
 
-```sh
-#!/usr/bin/env sh
+    #!/usr/bin/env sh
 
-printf "2 application/octet-stream\r\n"
-cat /dev/stdin
-```
+    printf "2 application/octet-stream\r\n"
+    cat /dev/stdin
 
 try visiting your spartan page, enter some input on that link line and see the
 result!
 
 alternatively you could send input directly in gelim:
 
-```sh
-gelim spartan://username.tilde.cafe/echo.sh -Ii 'hello!'
-```
+    gelim spartan://username.tilde.cafe/echo.sh -Ii 'hello!'
 
 (note: `-I` is so gelim quits immediately after displaying output, `-i` is for
 sending the input)