Build with ocicl instead of git submodules (first-pass)

[logoraz]

Description

This PR is a first pass at updating the build process to use ocicl to pull the cl systems needed instead of git submodules.
Opening for review and better visibility to align/clean things up accordingly. Happy to help/assist an any way necessary, just need advisement.

Update makefile to incorporate build with ocicl

• First pass at incorporating ocicl into build (needs refinement)
• Update makefile replacing submodules flag with ocicl flag
• Updated gitignore to ignore ocicl directory & asdf registry init.lisp
• Kept _build directory for later removal
• Did not include ocicl package registry ocicl.csv for now (this is where we would pin specific commits)
  • As of current this build will install latest of all cl systems

Fixes # (issue) - N/A

Checklist:

I have only tested this build with the electron variant as of current - would need assistance checking the below:

• Git branch state is mergable.
• Changelog is up to date (via a separate commit).
• New dependencies are accounted for.
• Documentation is up to date.
• Compilation and tests ((asdf:test-system :nyxt/<renderer>))
  • No new compilation warnings.
  • Tests are sufficient.