Refactor Ghost Ship to use a lot of stuff from octopusthink.com

[tofumatt]

This is a major refactoring of Ghost Ship. It brings in a lot of stuff we've learned from octopusthink.com, but it also allows the Blog and Portfolio sections of the website to be entirely optional. They can be removed by deleting the relevant folders—restoring the folders will actually restore the functionality. But no other config need be done.

In the future it'd be nice if you could "restore" the blog/portfolio functionality with an npm run add:blog functionality. For now, you can remove them that way (eg. npm run remove:blog).

It's a start. This'll be a beast to review and it's largely just ported and optimised stuff from https://github.com/octopusthink/octopusthink.com/

If you want to look through it feel free, but if you want to just merge it I've got no issues with that. It seems to work well! 😄

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• Part of Add an SEO component #19
• Closes Strip out Octopus-Think specifics #18
• Closes Automatically include Nautilus wrapper #15
• Closes Switch to non-relative import paths #14
• Closes Allow for blog, portfolio, etc. pages to be optional #12
• Part of Add some kind of sitemap component #3

[sarahmonster]

I'm down with merging this and then making any additional changes iteratively.

FYI #3 and #19 both warrant some more work before being closed, so I'd say this more part-fixes them than fully-fixes them! I might look into that SEO junk this evening though, since it's been on my list a while now.