Recent updates

Some things done in the last month...

- Added a new "video game concept" box in homepage. These groups need a proper description to appear there, so in the users page (Editing ideas section) there is a list of popular groups that need to be fixed.
- More work aimed at finally converting gametypes to tags.
- Much improved caching system, now testing with the groups pages. Will be uncommon to find a slow loading page even with groups with many games.
- Added PS5 and new XboxTwo in the hardware section just to get ready.
- Revisited the structured data in some pages to get some love from search engines.
- Added some images for platforms.
- Layout fixes.

Happy 2018