[Documentation] Update V1 Roadmap Timelines

[jessicadaugherty]

Description

Updating the roadmap timelines to reflect current project resources.

Issue

NA

Type of change

Please mark the relevant option(s):

• New feature, functionality or library
• Bug fix
• Code health or cleanup
• Major breaking change
• Documentation
• Other

List of changes

• Testnet delivery pushed back 2 months (May to July 2023)
• All other timelines pushed back accordingly
• "Last Updated" date updated to today
• Fixed minor issue with "M4" (was not hyperlinked to Milestones)

Testing

• make develop_test
• LocalNet w/ all of the steps outlined in the README

Required Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have tested my changes using the available tooling
• I have updated the corresponding CHANGELOG

If Applicable Checklist

• I have updated the corresponding README(s); local and/or global
• I have added tests that prove my fix is effective or that my feature works
• I have added, or updated, mermaid.js diagrams in the corresponding README(s)
• I have added, or updated, documentation and mermaid.js diagrams in shared/docs/* if I updated shared/*README(s)

[jessicadaugherty]

@Olshansk let me know if July is too aggressive?

[Olshansk]

Actually 🚢 it