Remove DevX roadmap doc link (#8781)

Remove DevX roadmap in pull request #8701,so remove doc link

## Description 

Describe the changes or additions included in this PR.
fix doc

## Test Plan 

no test required
---

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### Type of Change (Check all that apply)

- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes