Re-enable updating PagesDB with exported file in GitHub

[schang1146]

Thank you for your contribution to the ClintonCAT repo.
Before submitting this PR, please make sure:

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• The target of this PR is the main branch.
• No commits are missing from forked base branch (e.g. modified main branch instead of dev)
• You have squashed commits that might be considered: 'noisy' or partial, e.g. not candidates for cherry picking
• All test pass, run npm test
• The code is formatted, run npm run format
• You have updated or added test cases, as/if required
• You have installed and tried out the plugin in a supported browser

The goal of the PR is to re-enable fetching the remote pages DB file that's exported to GitHub. This will give developers more up-to-date data to work with.

Successful request to fetch exported JSON (inspecting network for extension):