Add devshell help text

flake.nix

@@ -32,6 +32,14 @@
           pkgs.rsync
           pkgs.pagefind
         ];
+        shellHook = ''
+          echo "make build - compile src/ into out/ with pagefind"
+          echo "make clean - delete out/ and srv/"
+          echo "make watch - rebuild on changes"
+          echo "make serve - serve out/"
+          echo "make pubdate - replace 'now' with the current date"
+          echo "make upload - build to srv/ and upload to alogoulogoi"
+        '';
       };
     };
   };