Update lmn_pre_install.rst - apt-get is deprecated #409

	# This is a basic workflow to help you get started with Actions

	name: VerifyDocs

	# Controls when the action will run.
	on:
	# Triggers the workflow on push or pull request events but only for the master branch
	push:
	branches: [ master ]

	pull_request:
	branches: [ master ]

	# Allows you to run this workflow manually from the Actions tab
	workflow_dispatch:

	# A workflow run is made up of one or more jobs that can run sequentially or in parallel
	jobs:
	# This workflow contains a single job called "build"
	build:
	# The type of runner that the job will run on
	runs-on: ubuntu-20.04

	# Steps represent a sequence of tasks that will be executed as part of the job
	steps:
	# Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
	- uses: actions/checkout@v2

	- name: Sphinx Build
	# You may pin to the exact commit or the version.
	# uses: ammaraskar/sphinx-action@8b4f60114d7fd1faeba1a712269168508d4750d2
	uses: ammaraskar/sphinx-action@master
	with:
	# The folder containing your sphinx docs.
	docs-folder: "./" # default is docs/
	# The command used to build your documentation.
	build-command: "sphinx-build -nW -b html -d build/doctrees source build/html" # optional, default is make html
	# Run before the build command, you can use this to install system level dependencies, for example with "apt-get update -y && apt-get install -y perl"
	# pre-build-command: # optional

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