people sometimes get confused about whether SD needs to be inserted for picross, so this clarifies that it's necessary and should hopefully get more people to actually install picross and not have it missing
Updates guide to support 11.15. In particular:
- Removal of browserhax as main guide path -- not completely removed/stubbed yet.
- Removal of Seedminer out-of-date warning.
- Addition of Seedminer to get-started and site-nav recommended.