fix: use a compressed logo image for `README.md`

[giladgd]

Description of change

• fix: use a compressed logo image for README.md
• chore: update recommended models
• build: switch to latest release of llama.cpp

Pull-Request Checklist

• [x] Code is up-to-date with the master branch
• [x] npm run format to apply eslint formatting
• [x] npm run test passes with this change
• [ ] This pull request links relevant issues as Fixes #0000
• [ ] There are new or updated unit tests validating the change
• [ ] Documentation has been updated to reflect this change
• [x] The new commits and pull request title follow conventions explained in pull request guidelines (PRs that do not follow this convention will not be merged)