NodeJS Version

### Issue type

**I'm submitting a ...** (check one with "x")

* [ ] bug report
* [x] feature request
* [ ] question about the decisions made in the repository

### Issue description

**Current behavior:**
I had NodeJS 13.14.0
Failed to execute neither npm i nor npm ci
```
10240 error gyp ERR! cwd D:\Projects\Javascript\Angular\ngx-admin\node_modules\node-sass
10240 error gyp ERR! node -v v13.14.0
10240 error gyp ERR! node-gyp -v v7.1.2
10240 error gyp ERR! not ok
10240 error Build failed with error code: 1
10241 verbose exit 1
```

**Current node-sass:**
```
package.json
https://github.com/akveo/ngx-admin/blob/master/package.json#L65

package-lock.json
https://github.com/akveo/ngx-admin/blob/master/package-lock.json#L13748
```

https://github.com/sass/node-sass :

Below is a quick guide for minimum and maximum supported versions of node-sass:

NodeJS | Supported node-sass version | Node Module
-- | -- | --
Node 16 | 6.0+ | 93
Node 15 | 5.0+ | 88
Node 14 | 4.14+ | 83
Node 13 | 4.13+, <5.0 | 79
Node 12 | 4.12+ | 72
Node 11 | 4.10+, <5.0 | 67
Node 10 | 4.9+, <6.0 | 64
Node 8 | 4.5.3+, <5.0 | 57
Node <8 | <5.0 | <57

NEED Node 12!!
You didn't say a word about it ((


**Expected behavior:**
```
Some issues need review, and may require choosing
a different dependency.
```

**Steps to reproduce:**
```
$ node -v
v13.14.0
$ git clone https://github.com/akveo/ngx-admin.git
$ cd ngx-admin && npm i
```

### Other information:

**npm, node, OS, Browser**
```
Node, npm: `v13.14.0` and `7.20.5`
OS: Windows 10 Home
Browser: Chrome
```