* Simplifies theme selector syntax

* Adds .dark theming class

* Adds design system page (dev env only)

* Refactors paypal-buttons -> paypal-product-buttons WebComponent

* Pulls out address to data file

* Defines annual subscription prices data hash

* Styles paypal-product-buttons

* Styles <address>

* Details have cursor:pointer on the summary

* Moves Jyne section to separate page

* Rewrites payment options using details components

* Reworks translation typing

* Defines MembershipType enum

* Adds translations for MembershipType enum

* Can pay annual subs by PayPal

* Styles tables better

* Adds soft hyphens to homepage

* auto-hyphenates!

* Tighter line-height in logo

* Fixes spacing and typography below xs breakpoint

* Fixes xs-sm spacing and typography

* Fixes border widths

* Link hover uses wavy underline instead of fat underline

* Fixes committee img layout on <xs

* Nice separators between committee members

* Better styling for committee member heading

* Consistent start-end block padding for sections

* Better breadcrumb styling

* Neatens alignment in footer

* Renames scss/variables -> scss/custom-properties

* Pulls out colours SCSS variables

* Merges margins and padding values

* Moves variables/colours -> values/colours

* Starts migrating spacing values to SCSS

* Pulls out typography logic to SCSS variables/functions

* Removes unneeded --er custom property

* Calculates grid-total-width-absolute in SCSS

* Forwards constants with @forward

* Removes TODOs and unnecessary assignment to --width-prose