feat: plot_spectrum optionally takes existing ax #39

	name: Build documentation

	on:
	pull_request:
	push:
	branches:
	- main

	jobs:
	deploy:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- uses: actions/setup-python@v2
	with:
	python-version: 3.x
	- name: Install dev dependencies
	run: \|
	pip install --upgrade pip
	pip install -r devtools/requirements-dev.txt

	- name: Install package
	run: \|
	pip install -e .

	- name: Build and deploy docs
	run: \|
	mkdocs gh-deploy --force

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