1.x-3.0.0-alpha6

Changes since 1.x-3.0.0-alpha5:

• Issue #70: Fix appearance page responsiveness. by @laryn and @docwilmot
• Issue #72: Pager styles. by @laryn
• Issue #73: Indicate disabled Views Display Menu Tabs visually. by @laryn and @saschaeggi
• Issue #77: Admin requirements dark mode improvements. by @laryn
• Reduce size of Layout condition buttons. by @laryn
• Slightly de-emphasize machine names in admin listings. by @laryn
• Ensure Admin Bar is higher z-index than Smart Menus default (998). by @laryn
• Layout visibility conditions tweaks. by @laryn
• Progress bar style adjustments: 7a861e6 and efabbe2 by @laryn
• Remove float on collapsible elements inside Edit Options. by @laryn
• Improve targeting of sidebar edit js. by @laryn