Add deck building helpers

[r0adkll]

Add helpers/tips in the deck-building interface that provide convenience to experienced players and guidance for new players.

Energy

See #121 For discussion on this feature

Trainers

This feature should be aware of or updated frequently for the meta to suggest stable trainer cards such as Cynthia, etc. This could be sourced manually, or done via analysis on our Deck database.

Pokemon

This feature could suggest some staple pokemon that are commonly found in decks, such as Tapu Lele- GX or Dedenne-GX. It would also be nice to expand this feature to do some kind of analysis on existing decks to suggest pokemon that they might want to add.