Fix /Close Issues

[Innkeeping]

Overview

Closing minor issues, as possible.

What features/fixes does this PR include? Changed link from old deprecated wiki to new 'WTF is Ethereum' Playbook. Updated link to current Ethereum playbook (#1739)

Updated wiki and forum links on 404 page. (#1737) Removed Discourse/forum mentions in discord-bot

Please provide the GitHub issue number

1739

1737

Closes #

1739

1737

Follow up Improvement Ideas

• [ ] Maybe just remove the links on start page
• [ ] Is this start page part of the current flow of the site?
• [ ] 404 issue mentions needing design changes?
• [ ] router on clicks are used in home and academy links which doesn't show hover overs
• [ ] Discord-bot still used? Still has sourcecred as well..

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