fix(build): exclude example directory from npm module

[reggeenr]

PR summary

Fixes: <! -- link to issue -->

PR Checklist

Please make sure that your PR fulfills the following requirements:

• The commit message follows the Angular Commit Message Guidelines.
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• New tests
• Build/CI related changes
• Documentation content changes
• Other (please describe)

What is the current behavior?

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[codecov]

Codecov Report

Merging #7 (966d7e2) into main (821afcb) will not change coverage.
The diff coverage is n/a.

❗ Current head 966d7e2 differs from pull request most recent head 08921d9. Consider uploading reports for the commit 08921d9 to get more accurate results

@@            Coverage Diff            @@
##              main        #7   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           64        64           
  Branches        14        14           
=========================================
  Hits            64        64           

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