markbind serve -d does not work with non root directory

[tlylt]

Is there an existing issue for this?

• I have searched the existing issues

Any related issues?

No response

Tell us about your environment

Windows 10

MarkBind version

Master branch

What did you do? Describe the bug

While working on the e2e test cases, I needed to run markbind serve test/e2e/test_site. After adding a -d to ensure latest changes are reflected, the site failed to serve at all.

Steps to reproduce

• Master branch MarkBind is installed properly
• Have a standard MarkBind site, cd into it
• Run markbind init temp to create a site in ./temp
• Running markbind serve -d works to serve the outer MarkBind site
• Running markbind serve temp -d does not

Expected behavior

The site to serve as per normal

Actual behavior

 v3.1.1
error: uncaughtException: ENOENT: no such file or directory, readFile 'C:\Users\User\Documents\GitHub\mb-test\docs/dist/js/vueCommonAppFactory.min.js' date=Fri Apr 08 2022 18:57:08 GMT+0800 (Singapore Standard Time), pid=10640, uid=null, gid=null, cwd=C:\Users\User\Documents\GitHub\mb-test, execPath=C:\Program Files\nodejs\node.exe, version=v14.15.1, argv=[C:\Program Files\nodejs\node.exe, C:\Users\User\AppData\Roaming\npm\node_modules\markbind-cli\index.js, serve, docs, -d], rss=202358784, heapTotal=168906752, heapUsed=142861080, external=3364121, arrayBuffers=677516, 
loadavg=[0, 0, 0], uptime=2064950
MemoryFileSystemError: ENOENT: no such file or directory, readFile 'C:\Users\User\Documents\GitHub\mb-test\docs/dist/js/vueCommonAppFactory.min.js'
    at MemoryFileSystem.readFileSync (C:\Users\User\Documents\GitHub\markbind\node_modules\memory-fs\lib\MemoryFileSystem.js:105:11)
    at Watching.handler (C:\Users\User\Documents\GitHub\markbind\packages\core-web\webpack.dev.js:90:20)
    at C:\Users\User\Documents\GitHub\markbind\node_modules\webpack\lib\Watching.js:99:9
    at AsyncSeriesHook.eval [as callAsync] (eval at create (C:\Users\User\Documents\GitHub\markbind\node_modules\tapable\lib\HookCodeFactory.js:33:10), <anonymous>:6:1)
    at AsyncSeriesHook.lazyCompileHook (C:\Users\User\Documents\GitHub\markbind\node_modules\tapable\lib\Hook.js:154:20)
    at Watching._done (C:\Users\User\Documents\GitHub\markbind\node_modules\webpack\lib\Watching.js:98:28)
    at C:\Users\User\Documents\GitHub\markbind\node_modules\webpack\lib\Watching.js:73:19
    at Compiler.emitRecords (C:\Users\User\Documents\GitHub\markbind\node_modules\webpack\lib\Compiler.js:499:39)
    at C:\Users\User\Documents\GitHub\markbind\node_modules\webpack\lib\Watching.js:54:20
    at C:\Users\User\Documents\GitHub\markbind\node_modules\webpack\lib\Compiler.js:485:14
    at AsyncSeriesHook.eval [as callAsync] (eval at create (C:\Users\User\Documents\GitHub\markbind\node_modules\tapable\lib\HookCodeFactory.js:33:10), <anonymous>:6:1)
    at AsyncSeriesHook.lazyCompileHook (C:\Users\User\Documents\GitHub\markbind\node_modules\tapable\lib\Hook.js:154:20)
    at C:\Users\User\Documents\GitHub\markbind\node_modules\webpack\lib\Compiler.js:482:27
    at C:\Users\User\Documents\GitHub\markbind\node_modules\neo-async\async.js:2818:7
    at done (C:\Users\User\Documents\GitHub\markbind\node_modules\neo-async\async.js:3522:9)
    at AsyncSeriesHook.eval [as callAsync] (eval at create (C:\Users\User\Documents\GitHub\markbind\node_modules\tapable\lib\HookCodeFactory.js:33:10), <anonymous>:6:1)

Anything else?

No response

[tlylt]

This is likely related to #1825 in how the root path is defined and used