fix: export pdf get package theme from local context

[davcd]

As discussed in #408 this fix will calculate the theme package from the local context instead the global one.
This will align the calculation of the theme package path, although in the future it will be interesting to unify every theme package access.
With these changes it will be possible to use:

npm install jsonresume-theme-my-theme
resume export resume.pdf --format pdf --theme my-theme
resume export resume.html --format html --theme my-theme

[github-actions]

🎉 This PR is included in version 3.0.6 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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