Create Documentation for Each Module

[czarcas7ic]

This is a continuation of the issue that was originally created on the osmosis repo

Modules Documentation breakdown & pendting items

• Epochs Module : Epochs docs
• Gamm Module : Gamm docs
• Lockup Module : Lockup docs
• Mint Module : Mint docs
• Pool Incentives Module : Pool Incentives docs
• Txfees Module : Txfees docs
• pool-incentives
• gov

Modules not TODO:

• txfees (queries and tx are odd I'm circling back)
• claim (not top priority since airdrop is over right?)
• simulation (not enough info on this)

Unsorted:

• auth
• bank
• distribution
• evidence
• slashing
• staking
• upgrade