docs: switch to npm

[ethomson]

Summary

Using npm for our docs site removes the need for an external program (npm is included with Node.js) and allows Minder developers to have a standardized package management tool.

Change Type

Mark the type of change your PR introduces:

• Bug fix (resolves an issue without affecting existing features)
• Feature (adds new functionality without breaking changes)
• Breaking change (may impact existing functionalities or require documentation updates)
• Documentation (updates or additions to documentation)
• Refactoring or test improvements (no bug fixes or new functionality)

Testing

This should produce identical documentation site from the previous one.

[rdimitrov]

@ethomson it seems that the CI is complaining about something

[coveralls]

coverage: 52.482% (-0.005%) from 52.487%
when pulling 8b62fbb on ethomson/npm
into cdb5ae7 on main.

[coveralls]

coverage: 52.482% (-0.005%) from 52.487%
when pulling e7b7cdc on ethomson/npm
into cdb5ae7 on main.