Update Ubuntu instructions

[CaptEmulation]

Updates Ubuntu instructions with the following changes:

• Prettifier fixes because my editor
• isolated-vm in Screeps requires Node10 and I can personally confirm does not work at all, even without mongodb/redis on Windows or Ubuntu with Node8
• screepsmod-tickrate now emits a message on console that its functionality is available in screepsmod-admin-utils

I didn't test all of these steps exactly because I already had a mongodb and redis instance running locally as daemon docker containers. In addition since I was not interested in running as a service I did not test the running-as-a-different-user-as-a-service instructions. However I am currently using PopOS 19, latest stable redis and mongodb and all seem to be working well together.

[ghost]

On Ubuntu Disco, you can just apt-get install nodejs and get node v10.
That's the preferred way of installing things.

[CaptEmulation]

@Dignissi Thanks for the tip. Even though I am on 19 I regularly switch NodeJS version so I personally use nvm. I updated the instructions to clarify that Disco can just install directly.

[tedivm]

This formatting has meaning- this blob is essentially yaml, so when you remove those spaces you're turning these variables from being underneath the contributed key to being top level variables.

[CaptEmulation]

thanks. Will fix and get out the no spray for VS Code

[CaptEmulation]

It looks like this is just tabs being replaced by spaces. They are still indented two times in and is valid YAML:

title: Private server on Ubuntu using MongoDB and Redis
contributed:
  name: tedivm
  link: https://github.com/tedivm
  date: 2018-02-07