build: update npm install command to use --legacy-peer-deps

This change modifies the build scripts to use --legacy-peer-deps flag when installing npm dependencies to resolve potential peer dependency conflicts during the build process. The change is applied to both bash (build.sh) and batch (build.bat) build scripts.

frontend/node_modules/path-is-absolute/readme.md

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+# path-is-absolute [![Build Status](https://travis-ci.org/sindresorhus/path-is-absolute.svg?branch=master)](https://travis-ci.org/sindresorhus/path-is-absolute)
+
+> Node.js 0.12 [`path.isAbsolute()`](http://nodejs.org/api/path.html#path_path_isabsolute_path) [ponyfill](https://ponyfill.com)
+
+
+## Install
+
+```
+$ npm install --save path-is-absolute
+```
+
+
+## Usage
+
+```js
+const pathIsAbsolute = require('path-is-absolute');
+
+// Running on Linux
+pathIsAbsolute('/home/foo');
+//=> true
+pathIsAbsolute('C:/Users/foo');
+//=> false
+
+// Running on Windows
+pathIsAbsolute('C:/Users/foo');
+//=> true
+pathIsAbsolute('/home/foo');
+//=> false
+
+// Running on any OS
+pathIsAbsolute.posix('/home/foo');
+//=> true
+pathIsAbsolute.posix('C:/Users/foo');
+//=> false
+pathIsAbsolute.win32('C:/Users/foo');
+//=> true
+pathIsAbsolute.win32('/home/foo');
+//=> false
+```
+
+
+## API
+
+See the [`path.isAbsolute()` docs](http://nodejs.org/api/path.html#path_path_isabsolute_path).
+
+### pathIsAbsolute(path)
+
+### pathIsAbsolute.posix(path)
+
+POSIX specific version.
+
+### pathIsAbsolute.win32(path)
+
+Windows specific version.
+
+
+## License
+
+MIT © [Sindre Sorhus](https://sindresorhus.com)