[Docs] Add user level documentation for Expressions #107

	# Sample workflow for building and deploying a Jekyll site to GitHub Pages
	name: Deploy GitHub Pages

	on:
	pull_request:
	branches:
	- master
	paths:
	- 'docs/**'

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

	# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
	permissions:
	contents: read
	pages: write
	id-token: write

	# Allow one concurrent deployment
	concurrency:
	group: "pages"
	cancel-in-progress: true

	jobs:
	# Build job
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout static page content
	uses: actions/checkout@v4
	with:
	repository: KratosMultiphysics/Documentation
	ref: master
	path: statik_content
	- name: Checkout current branch
	uses: actions/checkout@v4
	with:
	path: main
	- name: Configure page content
	shell: bash
	run: cp -r statik_content/Page_files/* main/docs/
	- name: Setup Pages
	uses: actions/configure-pages@v4
	- name: Create navigation menus
	shell: bash
	run: cd main/docs && python3 process_pages.py -t web
	- name: Build with Jekyll
	uses: actions/jekyll-build-pages@v1
	with:
	source: ./main/docs
	destination: ./main/docs/_site
	- name: Upload artifact
	uses: actions/upload-pages-artifact@v3
	with:
	path: ./main/docs/_site

	# Deployment job
	deploy:
	environment:
	name: github-pages
	url: ${{ steps.deployment.outputs.page_url }}
	runs-on: ubuntu-latest
	needs: build
	steps:
	- name: Deploy to GitHub Pages
	id: deployment
	uses: actions/deploy-pages@v4

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