Paragon installed as dependency instead of peer dependency

[adamstankiewicz]

@openedx/paragon is installed as a dependency within package.json for this repo. As a result, Paragon is included as part of the code bundle generated by frontend-component-header. Given this, consumers (MFEs) using frontend-component-header are effectively requiring users to download duplicate copies of Paragon (more than likely at different versions, too): one copy of Paragon for the MFE and another copy of Paragon for frontend-component-header.

That said, because Paragon supports tree shaking, only the components directly used by frontend-component-header are included in the bundle (i.e., not the entire library).

Generally, Paragon should be treated as a peer dependency in Open edX JS libraries, relying on the installed version of Paragon provided by the consumer (MFE). For some reason, the peer dependency was (incorrectly) removed in favor of a regular dependency in this PR.