[QOL Improvement] Show summary of type combos in addition to the Pokemon in offensive coverage weak/resist list.

[tur1ngb0x]

1. In the offense section, pick "Fighting" and "Flying" types.
2. In Pokedex Coverage, select "Resist" list.
3. The following Pokemon are shown.

   These Pokémon are resistant to all of the selected types. [Fighting][Flying]
   #026 Raichu (Alolan Form)				Electric/Psychic
   #145 Zapdos						Electric/Flying
   #479 Rotom (Rotom)					Electric/Ghost
   #479 Rotom (Fan Rotom)					Electric/Flying
   #587 Emolga						Electric/Flying
   #642 Thundurus (Incarnate Forme)			Electric/Flying
   #642 Thundurus (Therian Forme)				Electric/Flying
   #679 Honedge						Steel/Ghost
   #680 Doublade						Steel/Ghost
   #681 Aegislash (Shield Forme)				Steel/Ghost
   #681 Aegislash (Blade Forme)				Steel/Ghost
   #702 Dedenne						Electric/Fairy
   #741 Oricorio (Pom-Pom Style)				Electric/Flying
   #785 Tapu Koko						Electric/Fairy
   #848 Toxel						Electric/Poison
   #849 Toxtricity (Amped Form)				Electric/Poison
   #957 Wattrel						Electric/Flying
   #958 Kilowattrel					Electric/Flying
   #977 Gholdengo						Steel/Ghost
   

4. Show Pokemon type combo (de-duplicated) at the start of offensive coverage resist list.

   These 6 type combos are resistant to all of the selected types. [Fighting][Flying]
   * Electric/Fairy
   * Electric/Flying
   * Electric/Ghost
   * Electric/Poison
   * Electric/Psychic
   * Steel/Ghost
   
   These Pokémon are resistant to all of the selected types. [Fighting][Flying]
   #026 Raichu (Alolan Form)				Electric/Psychic
   #145 Zapdos						Electric/Flying
   .
   .
   .
   .
   .
   #958 Kilowattrel					Electric/Flying
   #977 Gholdengo						Steel/Ghost
   

5. This would save a bit of time in cases where the list of Pokemon resistant/weak to certain move types spans multiple pages.
6. The same suggestion would apply to offensive coverage weakness list.

[wavebeem]

Cool idea! Are you interested in working on a PR for this?

I'm thinking about spending some time today working on issue #132 so I'm not sure if this is something I would get to soon or not.