[Bug]: Documentation lacking a step

[bigbeka]

Issue Description

make build step in the docker installation guide for Linux is missing a step to check if npm is installed on the host. If it is not installed, make build can't continue to npm install. https://docs.opensignlabs.com/docs/self-host/docker/run-locally

Expected Behavior

make build needs to check if all the dependencies for building are installed.

Current Behavior

If npm is not installed, make build fails.

Steps to reproduce

Run make build on a host without npm installation.

Screenshots of the issue(optional)

No response

Operating System [e.g. MacOS Sonoma 14.1, Windows 11]

Debian Proxmox > LXC Ubuntu 22.04

What browsers are you seeing the problem on?

No response

What version of OpenSign™ are you seeing this issue on? [e.g. 1.0.6]

2.0.0

What environment are you seeing the problem on?

No response

Please check the boxes that apply to this issue report.

• [X] I have searched the existing issues & discussions to make sure that this is not a duplicate.

Code of Conduct

• [X] I agree to follow this project's Code of Conduct
• [X] I have searched the existing issues & discussions to make sure that this is not a duplicate.