fix: re-adds support for iOS 12 by transpiling lit

[steveworkman]

Proposed Change

Changes the babel settings of the rollup config to transpile lit-related modules that were using nullish coallescing since lit 3.0. Also adds in the nullish coalescing plugin to the babel plugins.

Whilst I was at it, I added in the rollup-dev.config.mjs file that is referenced in the npm run watch command but was missing, and added the --bundleConfigAsCjs option to npm start so that works again.

Related issues

Fixes #1343

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] Other (build / ci etc.)

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] Any dependent changes have been merged and published in downstream modules

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[marksie1988]

what is the reason for rolling back this to an old version?

"rollup-plugin-serve": "^3.0.0", "rollup-plugin-serve": "^1.1.1",

[steveworkman]

what is the reason for rolling back this to an old version?

"rollup-plugin-serve": "^3.0.0", "rollup-plugin-serve": "^1.1.1",

rollup-plugin-serve@3 fails to run with an error of:

[!] Error: require() of ES Module /Users/me/code/atomic-calendar-revive/node_modules/mime/dist/src/index_lite.js from /Users/me/code/atomic-calendar-revive/node_modules/rollup-plugin-serve/dist/index.cjs not supported.
Instead change the require of index_lite.js in /Users/me/code/atomic-calendar-revive/node_modules/rollup-plugin-serve/dist/index.cjs to a dynamic import() which is available in all CommonJS modules.

It doesn't like the ES Module and is related to https://github.com/thgh/rollup-plugin-serve/issues/102. I've updated to v2 and pushed the change

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:tada: This PR is included in version 9.8.0-beta.3 :tada:

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[github-actions[bot]]

:tada: This PR is included in version 10.0.0 :tada:

The release is available on GitHub release

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