cleanup: clean up docs/ directory and consent source files

programs/include/montauk/syscall.h

@@ -132,7 +132,7 @@ namespace montauk {
         return (int)syscall1(montauk::abi::SYS_GETCAPS, (uint64_t)out);
     }
 
-    // Consent agent (the desktop only; see docs/consent.md).
+    // Consent agent.
     inline int consent_register() {
         return (int)syscall0(montauk::abi::SYS_CONSENT_REGISTER);
     }