chore(build): serve parcel without HMR

Description

Disable HMR when running Parcel.

Motivation and Context

Electron cannot currently handle loading websockets when a custom protocol is used. We are not actively utilizing HMR from parcel regardless, which means we can safely disable it when running Parcel.

An electron bug has been filed: https://github.com/electron/electron/issues/12855

How Has This Been Tested?

I ran the nOS client on the feat/nos-protocol branch and loaded the content at nos://localhost:1234 successfully.

Screenshots (if appropriate):

Types of changes

[x] Chore (tests, refactors, and fixes)
[ ] New feature (adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

[x] My code follows the code style of this project.
[x] The commit message follows our guidelines
[ ] Tests for the changes have been added (for bug fixes / features)
[ ] Docs have been added / updated (for bug fixes / features)
[x] I have read the CONTRIBUTING document.

Closing issues

N/A

nos / create-nos-dapp

chore(build): serve parcel without HMR #8