Add "Weather Conditions" textarea for pack creation

[maplethorpej]

• Textarea will need to be added to create pack view
• Backend will need a migration to add this field
• Pack view will need this information added

[Callisto13]

I think this may already be done, or at least not really needed?

TLDR of this slack thread; The temp-range text box can already support 255 characters, and can be renamed to "Conditions" to cover all weather aspects.

The alternative is to create "Weather Conditions" tags which can be added to packs and used to search/sort packs later (https://github.com/maplethorpej/packstack/issues/16#issuecomment-759623802). Likewise Temp could stop being a text box, but rather be a strict to-from range which can be later used in search/sort.