migrate autostart to new Lua format

dot_config/hypr/autostart.lua

@@ -0,0 +1,8 @@
+-- Extra autostart processes.
+-- o.launch_on_start("my-service")
+
+hl.on("hyprland.start", function()
+  hl.exec_cmd(o.launch_webapp("https://app.slack.com/client"), { workspace = "special:slack silent" })
+end)
+o.launch_on_start("1password")
+