[Offline Fallback Page article] Add automatic reload feature

[tomayac]

Changes proposed in this pull request:

• Following @petele's suggestion added automatic reload.

[chrome-devrel-review-bot]

Hello! This is an automated review by our custom reviewbot. It updates automatically when code or GitHub comments in this pull request are created or updated.

Requested changes

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src/site/content/en/progressive-web-apps/offline-fallback-page/index.md

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[github-actions]

Alex Recommends Report

Alex recommends the following language changes, but Alex is a regular expression based algorithm, so take them with a grain of salt.

src/site/content/en/progressive-web-apps/offline-fallback-page/index.md

Level	Location	Word	Recommendation
⚠️	78:61	simple	simple may be insensitive, try not to use it
⚠️	79:48	just	just may be insensitive, try not to use it

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