Update README roles

[Filipopoi]

Impostor

• FireWorker -> FireWorks

Madmate

• Crewposter -> Crewpostor
• Mad Guardian: fixed link
• Mad Snitch: fixed link

Crewmate

• Investigator: updated description
• Sabotage Master -> Repairman

Neutral Killing

• Agitater -> AgiTater
• Egoist: updated description
• The Glitch
  • Updated Ability
  • Glitch -> The Glitch

Neutral Passive

• Archangel: removed
• Copy-Cat -> Copycat
• Hacker: updated description
• Schrodinger's Cat -> Schrödinger's Cat
• Survivor: added space after "Win Condition:"

Modifier

• Oblivious: added Pass on Death option