Add automated workflow publishing capabilities

[d33bs]

Description

This PR adds the capability to publish the Almanac's content automatically through GitHub Actions to address #18 . This adds HTML and PDF content through GitHub Pages. I tried to include ePub with this work but found that it's more complicated than the HTML or PDF content publishing process. As a result, I plan to address that aspect outside this PR, but I don't consider it critical (as both an offline and online option are provided here).

I also noticed that:

• the logo wasn't working when linked from an HTTP reference, so updated this.
• publishing wasn't looking correct with a preface placeholder so I removed it entirely.

Thanks for any feedback you may have!

Closes #18 (#30 created for ePub tracking as follow-up)

What is the nature of your change?

• [ ] Content additions or updates (adds or updates content)
• [ ] Bug fix (fixes an issue).
• [x] Enhancement (adds functionality).
• [ ] Breaking change (these changes would cause existing functionality to not work as expected).

Checklist

Please ensure that all boxes are checked before indicating that this pull request is ready for review.

• [x] I have read the CONTRIBUTING.md guidelines.
• [x] My code follows the style guidelines of this project.
• [x] I have performed a self-review of my own contributions.
• [x] I have commented my content, particularly in hard-to-understand areas.
• [x] I have made corresponding changes to related documentation (outside of book content).
• [x] My changes generate no new warnings.
• [x] New and existing tests pass locally with my changes.
• [ ] I have added tests that prove my additions are effective or that my feature works.
• [x] I have deleted all non-relevant text in this pull request template.

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[d33bs]

Thanks @falquaddoomi and @gwaybio for the reviews!

I've noticed that, in the PDF version of the book and when you select the ".pdf" option from the "Download" dropdown in the HTML version, the PDF has a "Skip to main content" overlay on each page that covers up some of the content.

Thanks for bringing this up! I did some investigation and found that this relates to https://github.com/executablebooks/jupyter-book/issues/2045 and https://github.com/pydata/pydata-sphinx-theme/issues/1745 . I've added a bit of CSS to avoid displaying the "skip" content when printing through Chromium (which is how the PDF is compiled).