Support templateable category pages

[woodwoerk]

Render category pages based on category type layout configuration. If a layout hasn't been defined, fall back to the old category page rendering.

Available to test in staging:

1. Tampere:
   1.a. Example with custom hero, main and aside layout content
   1.b. Example with custom header content and main layout, no aside
2. SCA:
   2.a. Example with aside links & contact information
   2.b. Example with no custom layout, fallback applied

Note: There are still some spacing issues/ inconsistencies to be fixed.

[terotik]

Looks good (apart from the spacing issues) but ok to publish now if this is time sensitive and handle those spacings later

I know it's a challenge to use originally full page width streamfield blocks in containers :)