terminal: KAM (mode 2)

This has an associated config `vt-kam-allowed` which defaults to "false"
since this mode can cause the terminal to become mostly unusable. We
include this mode for completions sake however.

website/app/vt/modes/kam/page.mdx

@@ -0,0 +1,28 @@
+import VTMode from "@/components/VTMode";
+
+# Keyboard Action Mode (KAM)
+
+<VTMode value={2} ansi={true} />
+
+Disable all keyboard input.
+
+This mode is unset as part of both [full reset (RIS)](/vt/ris)
+and [soft reset (DECSTR)](/vt/decstr).
+
+A poorly behaved terminal program can lock the terminal emulator
+using this command. Terminal emulators should provide a mechanism
+to reset this or outright disable it.
+
+## Validation
+
+### KAM V-1: Disable Keyboard Input
+
+```bash
+printf "\033[1;1H" # move to top-left
+printf "\033[0J" # clear screen
+printf "Keyboard input is now disabled.\n"
+printf "\033[2h"
+sleep 5
+printf "\033[2l"
+printf "Keyboard input is re-enabled.\n"
+```

website/components/VTMode.tsx

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+export default function VTMode({
+  value,
+  ansi = false,
+}: {
+  value: number;
+  ansi: boolean;
+}) {
+  return (
+    <div className="flex my-2.5">
+      <div className="border px-1 grid grid-rows-2 grid-cols-1 text-center">
+        <div>
+          {ansi ? "?" : ""}
+          {value}
+        </div>
+      </div>
+    </div>
+  );
+}