Improve accessibility of viewport meta by allowing page zoom (related to #945)

[chicgeek]

Description

Relates to one item mentioned in #945.

Setting maximum-scale=1.0 and user-scalable=no for the viewport meta content has a major detrimental impact on accessibility. Removing these values allows users to optionally zoom and preserves the default experience for other users.

I have made this fix in the default HTML template, but also updated docs and the SSR template.

References

• Quick tip: Never use maximum-scale=1.0 from The A11Y Project
• Viewport guidelines for browser Zoom from web.dev (Google)

Summary

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe: accessibility improvement

If changing the UI of default theme, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)

You have tested in the following browsers: (Providing a detailed version will be better.)

• Chrome
• Firefox
• Safari
• Edge
• IE

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature
• Related documents have been updated
• Related tests have been updated

To avoid wasting your time, it's best to open a feature request issue first and wait for approval before working on it.

Other information:

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• DO NOT include files inside lib directory.

[anikethsaha]

thanks 🥇

[Koooooo-7]

thx. 👍