Fixed '\mathcal{I}' latex error when it should have just been 'I' #162

	# Workflow for deploying fdm-jupyter-book to GitHub Pages (https://www.devitoproject.org/devito_book/)
	name: Deploy Jupyter Book

	# Only run this when the master branch changes
	on:
	push:
	branches:
	- master

	# This job installs dependencies, build the book, and pushes it to `gh-pages`
	jobs:
	deploy-book:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3

	# Install dependencies
	- name: Set up Python 3.9
	uses: actions/setup-python@v4
	with:
	python-version: 3.9

	- name: Install dependencies
	run: \|
	pip install -r requirements.txt
	pip install --user git+https://github.com/devitocodes/devito.git

	# Build the book
	- name: Build the book
	run: \|
	npm rebuild node-sass
	jupyter-book clean fdm-jupyter-book
	jupyter-book build fdm-jupyter-book

	# Push the book's HTML to github-pages
	- name: GitHub Pages action
	uses: peaceiris/actions-gh-pages@v3.9.1
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	publish_dir: ./fdm-jupyter-book/_build/html

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