[Refactor]: New "PSProfile" Directory Structure

Replace outdated "Profile" folder with a new "PSProfile" directory containing the following structure:

- [x] `PSProfile.Aliases`
- [x] `PSProfile.Functions`
- [ ] `PSProfile.Integrations`
- [ ] `PSProfile.Modules`
- [x] `PSProfile.Prompt`
- [ ] `PSProfile.Options`
- [ ] `PSProfile.Secrets`
- [ ] `PSProfile.Style`
- [ ] `PSProfile.Completions`

and update primary `Profile.ps1`