Dockerization & Multiline tables

[dendrondal]

So I'd thought I'd added this in via #94, but I'm going ahead and adding in my multi-line table directive with this because it's quite small. Let me know if you want me to cherry-pick those commits for a separate feature branch.

This PR seeks to add two features:

1. Dockerization, to have consistent cross-platform performance and eliminate numerous latex headaches. Has been added to CI.

2. Mutli-line table directives. I often found pandoc creating tables where text overlapped with adjacent columns. I used the make multiline tables directive often to fix this. I also included a secondary directive to convert the table into raw TeX, which was very useful for adding landscape tables. Examples for use cases with these have also been added.