Migrate from preact to react

[Sharqiewicz]

With all the packages in the portal updated in the last 2 weeks, the migration was really straightforward.

What have I done?

1. Replace the Preact-related packages with React and React-dom
2. Remove all properties specific to Preact
3. Migrate event system to React synthetic event system
4. Remove deprecated babel configuration for tests in the project
5. Remove all outdated and unused files and configurations

to do:

• [x] test all the functionalities (99%)
• [x] update readme
• [x] review all todo (in the code)

tested:

Staking

• [x] stake
• [x] unstake
• [ ] unlock
• [x] rewards update
• [x] rewards claim

Forex AMM

• [x] Swap
• [x] Swap pools Deposit/Withdraw
• [x] Backstop pools Deposit/Withdraw

Spacewalk

• [x] Bridge
• [x] Transactions

Wallet connection

• [x] Connect
• [x] Disconnect

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[Sharqiewicz]

@ebma @TorstenStueber The migration is ready for review ✅

[Sharqiewicz]

@TorstenStueber @ebma Applied the changes