Script and style registration.

[sustained]

See discussion in #84 for rationale.

This allows us to register styles and scripts per page/layout by simply specifying them in the YAML front matter.

This means we can only include expensive UIKit files as and where needed. Currently this isn't being used anywhere but I plan to make use of it in my big upcoming docs PR.

Example

---
scripts:
  - /assets/css/uikit/components/autocomplete.min.js
styles:
  - /assets/css/uikit/components/autocomplete.min.css
---

There are two arguably unrelated commits in here but I don't feel that it's an issue personally.

Excluding vendor.

I was basically unable to run the site locally until I fixed this issue.

Ignoring vendor.

Shouldn't it be ignored anyway? Without it there's several thousand files in my sidebar and any PR I made would mean that the entire vendor directory would be included... I honestly don't understand why it's not ignored as is.

[Tonius]

Where does vendor come from? I don't think I ever saw that before.

[sustained]

Perhaps it has to do with how I installed things. It just contains the dependencies. Think of it like node_modules if you've used Node/JS.

Perhaps you installed things globally/system-wide? I had problems doing that and had to do this instead.

Additionally, my install of the site contains a .bundle/config file which says that the BUNDLE_PATH is vendor/bundle.

[sustained]

Basically bundle install failed no matter what I tried so in the end I succeeded with bundle install --path vendor/bundle. I wasn't really sure what the problem was since it's been many years since I worked with Ruby/gems and such, actually I recall now - the error messages I were getting recommended trying it with --path vendor/bundle.

[sustained]

I am going to close this since at this point I am now working on adding code highlighting (without embedding Gists) to the docs examples on my other big up and coming PR and I need this functionality there (I don't want to include the stylesheets globally), so I will just do it there instead.