Some wamr-ide improvements (#1354)

including:
- enable macOS support
- documentation improvements
- fix some warnings

test-tools/wamr-ide/WASM-Debug-Server/Docker/README.md

@@ -3,7 +3,6 @@
 -   Linux
 
     ```shell
-    chmod +x resource/*
     ./build_docker_image.sh
     ```
 
@@ -18,4 +17,4 @@
 
 -   `Dockerflie` is the source file to build `wasm-debug-server` docker image
 -   `resource/debug.sh` is the script to execute the wasm app in debug mod, will start up the debugger server inside of the `iwasm` and hold to wait for connecting.
--   `resource/run.sh` is the script to execute the wasm app directly.
+-   `resource/run.sh` is the script to execute the wasm app directly.

test-tools/wamr-ide/WASM-Debug-Server/Docker/build_docker_image.sh

@@ -1,8 +1,9 @@
+#!/bin/bash
+
 # Copyright (C) 2019 Intel Corporation.  All rights reserved.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-#!/bin/bash
 docker build -t wasm-debug-server:1.0 .
 
 # delete intermediate docker image
-docker image prune -f
+docker image prune -f