Allow users to query the wiki in a meaningful way

[jedmund]

Siero should enable users to have conversations about characters, weapons, summons and items with detailed information at their fingertips.

Feature list

• Search the wiki and get a relevant URL in return
• Search the wiki for an entity and get a Rich Embed in return

MedusaBot in Granblue Gaijins is a good reference. Siero should be able to do what Medusa can do, and then we can make it better.

[jedmund]

Medusa plaintext search:

Medusa weapon search:

Medusa character search:

Ideas:

• Returning a list of all items that match a plaintext search instead of "I couldn't find anything"
• Returning a list of all weapons that can be dropped by a specific raid

[jedmund]

Potential schema #1

# We do the work making this magic:
$wiki <item_name>

Potential schema #2

# Separate keys for each resource type:
$wiki weapon <weapon_name>
$wiki summon <summon_name>
$wiki character <character_name>
$wiki item <item_name>