command.wasm : add voice assistant example for the Web (#171)

Same as the command-line tool "command", but runs in the browser

Also, added helper script "extra/deploy-wasm.sh" and fixed some timing
constants for the WASM examples.

examples/CMakeLists.txt

@@ -21,6 +21,7 @@ include_directories(${CMAKE_CURRENT_SOURCE_DIR})
 if (EMSCRIPTEN)
     add_subdirectory(whisper.wasm)
     add_subdirectory(stream.wasm)
+    add_subdirectory(command.wasm)
     add_subdirectory(talk.wasm)
 else()
     add_subdirectory(main)