docs: Update Installation, overview, quickstart and Cortex version commands

[irfanpena]

Describe Your Changes

• Update Installation and Add the versions description in the overview

Fixes Issues

• Closes docs: Sprint 21 docs updates cortex.cpp#1243
• Closes #

Self Checklist

• Installation:
  • Cortex.cpp: Installation & Uninstallation cortex.cpp#1114
  • epic: Cortex.cpp Installer MVP (Local & Network Installer) cortex.cpp#1030
• Overview that include Cortex.cpp versions:
  • epic: Stable, Beta and Nightly Builds cortex.cpp#1065
• Quickstart
• Include commands for each version
  • epic: Stable, Beta and Nightly Builds cortex.cpp#1065

[github-actions]

Preview URL: https://223b583b.cortex-docs.pages.dev

[irfanpena]

Still need to update the links in the docs, as the official download is not yet released