[EPIC] EVM Docs

[Aliserag]

Feel free to break this up as needed @ianthpun and @bthaile

### Tasks to completion
- [ ] Flatten folder structure. Make default all folders open instead of needing to click to open.
- [ ] https://github.com/onflow/docs/issues/655
- [ ] https://github.com/onflow/docs/issues/807
- [ ] https://github.com/onflow/docs/issues/685
- [ ] https://github.com/onflow/docs/issues/703
- [ ] https://github.com/onflow/docs/issues/570
- [ ] https://github.com/onflow/docs/issues/688
- [ ] https://github.com/onflow/docs/issues/736
- [ ] https://github.com/onflow/docs/issues/867
- [ ] https://github.com/onflow/docs/issues/846
- [ ] https://github.com/onflow/docs/issues/735
- [ ] https://github.com/onflow/docs/issues/659
- [ ] https://github.com/onflow/docs/issues/656
- [ ] https://github.com/onflow/docs/issues/658
- [x] https://github.com/onflow/docs/issues/729
- [ ] https://github.com/onflow/docs/issues/631
- [ ] https://github.com/onflow/docs/issues/808
- [ ] https://github.com/onflow/docs/issues/821