fix(dependencies): removing @ng-bootstrap/ng-bootstrap from the dependencies

[Pilpin]

PR Checklist

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• The commit message follows our guidelines: CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[x] Other... Please describe: removed a dependency on @ng-bootstrap/ng-bootstrap

What is the current behavior?

@ng-bootstrap/ng-bootstrap is needed

Issue Number: 89

What is the new behavior?

@ng-bootstrap/ng-bootstrap is not needed anymore

Does this PR introduce a breaking change?

[x] Yes
[ ] No

Users using ng-bootstrap should add ref.componentInstance.dismiss.subscribe(() => ref.close()); to their registerHelpModal function.

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[boop5]

@NetanelBasal is there a particular reason this fix is not pushed to npm yet? I'd really like to replace my @HostListeners with this lib🔥

thanks

[NetanelBasal]

This is a breaking change so I'm waiting for this https://github.com/ngneat/hotkeys/pull/91/files