chore: adds initial crowdloan docs for kusama launch

[dutterbutter]

This is a DRAFT PR that adds documentation for crowdloan campaign event. There are a few items missing / need updating:

• [x] Need to finalize crowdloan page on dApp
• [ ] Add screenshots showing crowdloan page inputs once eggnet is on Rococo
• [ ] Outline common user FAQs
• [x] Confirm Egg network name
• [x] Finalize and confirm crowdloan details

Related to #23

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