Fix some Series Landing Page bugs in Largo, and update this site to the new version of Largo

[benlk]

In Landing pages, the 'Main' panel is not working correctly: Sort by 'Oldest First" does not work, and the display attributes (byline, featured image, etc,) become UNchecked if you return to edit the page. Miranda verified the backend does keep the attributes, but if the editor goes back into the page, they have to remember to check them again.

• Saved value of checked boxes doesn't update: https://github.com/INN/largo/issues/1870 and should be ~2h to fix.
• I think the sort order problem is https://github.com/INN/largo/issues/843 and should be ~2h to fix.

[kaylima]

@benlk In priority order:

• Saved value of checked boxes doesn't update: INN/largo#1870 and should be ~2h to fix.
• Then sort order

Please let me know when you've hit 2 hours and what progress has been made. Thanks!