Updated mediawiki/extensions
Project: mediawiki/extensions/GettingStarted  81f1e94f482d61afbf3ee544f60a08bf98b55cd4

Don't use the deprecated mw-ui-primary CSS class

Use the mw-ui-progressive CSS class for the primary CTA, rather than
mw-ui-primary, which is deprecated.

Change-Id: Id33ce8ad366c0d0adb4157a93c1532132700f4bb