Blank Page after installation

[igoryonya]

Describe the bug
After installation on the clean machine, configuring the config.json file, launching the server.js, and loaging the page, I get the blank page.

To Reproduce
Steps to reproduce the behavior:

1. Install:
   sudo su
   curl -fsSL https://deb.nodesource.com/setup_17.x | sudo -E bash -
   apt-get install -y nodejs
   git clone https://github.com/pablomarle/networkmaps.git
2. Configure: nano /etc/networkmaps/config.json
   {    "socket": {        "address": "192.168.0.200",        "port": 3000    },    "sendmail": {        "server": "192.168.0.100",        "port": 587,        "is_secured": false,        "user": "[email protected]",        "password": "pass",        "from": "[email protected]"    } }
3. mkdir -vp '/var/lib/networkmaps/users' '/var/lib/networkmaps/diagrams' '/var/lib/networkmaps/sendmail/queue' '/var/lib/networkmaps/sendmail/sent' '/var/lib/networkmaps/shapes'
4. cd networkmaps/
5. Starting the server: ./server.js
   `
   Config file read from default (/etc/networkmaps/config.json)
   Use '--config <path_to_cfg_json>' to change config file location.
   Configuration file read.

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Server running at http://192.168.0.200:3000/
6. Loading url in FireFox 97: http://192.168.0.200:3000/ And get an empty page, that has a source code:<title>Network Maps</title><script type="text/javascript">let wsconfig="ws://192.168.0.200:3000/";let appserver="http://192.168.0.200:3000";let staticurl="http://192.168.0.200:3000";</script><script src="[http://192.168.0.200:3000/static/js/DOM.js](view-source:http://192.168.231.14:3000/static/js/DOM.js)"></script><script src="[http://192.168.0.200:3000/static/js/index.js](view-source:http://192.168.231.14:3000/static/js/index.js)"></script>`

Expected behavior
Loading the app.

Desktop (please complete the following information):

• OS: Ubuntu 20.04.3 LTS (Linux netdisco-perl-lubunt 4.4.0-166-generic #195-Ubuntu SMP Tue Oct 1 09:35:25 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux)
• Browser: FireFox 97.0 (64-bit)
• Version: Cloned the repo today