Rename /halyde/shell to /halyde/scripts

The reason is because there will have to be a place to put scripts that
are not apps.

halyde/config/startupapps.json

@@ -1 +1 @@
-["/halyde/shell/shell.lua"]
+["/halyde/scripts/shell.lua"]

halyde/scripts/shell.lua

@@ -141,7 +141,7 @@ while true do
   if workingDirectory:sub(-1, -1) ~= "/" then
     workingDirectory = workingDirectory .. "/"
   end
-  local shellCommand = terminal.read("shell", shellcfg.prompt:format(workingDirectory))
+  local shellCommand = terminal.read({readHistoryType = "shell", prefix = shellcfg.prompt:format(workingDirectory)})
   shell.run(shellCommand)
   gpu.freeAllBuffers()
 end

lib/shell.lua

@@ -1,7 +1,7 @@
 local filesystem = require("filesystem")
 
 -- get a list of installed shells
-local shellDir = filesystem.list("/halyde/shell/")
+local shellDir = filesystem.list("/halyde/scripts/") -- HACK: /halyde/scripts features more than just shells!
 local shells = {}
 for i=1,#shellDir do
   table.insert(shells,string.match(shellDir[i],"([^/]+)%.lua$"))