dev: add better support of `npm link`

[jma]

• Adds symbolic link preference to the typescript compilation preference.
• Fixes bootstrap inclusion in style files.

Co-Authored-by: Johnny Mariéthoz Johnny.Mariethoz@rero.ch

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Code review check list

• [ ] Commit message template compliance.
• [ ] Commit message without typos.
• [ ] File names.
• [ ] Functions names.
• [ ] Functions docstrings.
• [ ] Unnecessary commited files?
• [ ] Extracted translations?