Wikivoyage pages have more than 3 related articles as they make use
of the {{#related:}} magic word.
After speaking with Nirzar we should allow this project to show more than 3.
This change allows this while keeping the existing behaviour on other wikis and
will pave the way for removing a bunch of code from this extension.
Additional changes:
* Cleanup skinStyles definitions
* Limit cards to 30% maximum width and give margin top to account for
situations where the number of cards are multiple of 3
** In Minerva hardcode the max-width to pixels.
* Margins are switched from hardcoded 10px to percentage based. Yes
this changes the right margin slightly but is more maintable and visually
the same.
Bug: T164765
Change-Id: I41119de3228c2df799f740d4bd00082101c21b97
* Move across all files
* Rename ext-card- prefix to ext-related-articles- prefix
** Since all code using these prefixes is JS
we do not have to worry about cached HTML
Bug: T137021
Change-Id: I784fd132c36329fa0dcc49fe2804460061940347
