Revert "Add defer attribute to scripts in page template (#2492)"

[yucheng11122017]

This reverts commit 8ad1b0c7e1b5bc42635a83398701f256ada274f2.

What is the purpose of this pull request?

• [ ] Documentation update
• [X] Bug fix
• [ ] Feature addition or enhancement
• [ ] Code maintenance
• [ ] DevOps
• [ ] Improve developer experience
• [ ] Others, please explain:

Reverting #2492 due to breaking of modal

Overview of changes:

Anything you'd like to highlight/discuss:

Testing instructions:

Proposed commit message: (wrap lines at 72 characters) Revert adding defer attribute to scripts

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Checklist: :ballot_box_with_check:

• [ ] Updated the documentation for feature additions and enhancements
• [ ] Added tests for bug fixes or features
• [X] Linked all related issues
• [X] No unrelated changes

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Reviewer checklist:

Indicate the SEMVER impact of the PR:

• [ ] Major (when you make incompatible API changes)
• [ ] Minor (when you add functionality in a backward compatible manner)
• [ ] Patch (when you make backward compatible bug fixes)

At the end of the review, please label the PR with the appropriate label: r.Major, r.Minor, r.Patch.

Breaking change release note preparation (if applicable):

• To be included in the release note for any feature that is made obsolete/breaking

Give a brief explanation note about:

• what was the old feature that was made obsolete
• any replacement feature (if any), and
• how the author should modify his website to migrate from the old feature to the replacement feature (if possible).

[github-actions[bot]]

@yucheng11122017 Each PR must have a SEMVER impact label, please remember to label the PR properly.