chore: removes unnecessary gitignore and npmignore files

[thedanchez]

Description

This PR removes all superfluous .npmignore and some missed .gitignore files. The .npmignore files are only relevant for packages that are being published to npm so the packages under examples/* have no need for them. Moreover, since the packages under the packages/* directory already specify files in their package.json, the .npmignore files there are also not necessary because the files takes precedence in whitelisting what gets published to npm.

The .gitignores are not needed since we have a global, top-level one.

Type of change

• Housekeeping

How Has This Been Tested?

• CI Checks Pass

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings