fix(v1,v2): Add initial-scale=1.0 to all meta viewport tags

[nebrelbug]

Motivation

When viewing my Docusaurus site (https://squirrelly.js.org) on a mobile device, it is correctly sized on first load. Almost immediately after that, however, it resizes so that it isn't the full width of the page (see below). Changing <meta name="viewport" content="width=device-width"> to <meta name="viewport" content="width=device-width, initial-scale=1.0"> solves the problem.

Strangely, I can't reproduce the issue on other Docusaurus sites. However, since I believe it's best practice to include initial-scale=1, I figured I'd submit the PR anyway.

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

Visually ensure that Docusaurus doesn't change its appearance.

[docusaurus-bot]

Deploy preview for docusaurus-2 ready!

Built with commit 3371652

https://deploy-preview-3290--docusaurus-2.netlify.app

[slorber]

Hi,

Not very familiar with this problem.
Can this change affect other sites in a bad way?

However, since I believe it's best practice to include initial-scale=1

What authoritative source claims that?

I think the change should be fine but try to avoid something bad by mistake :)

[slorber]

btw was wondering, is this file still useful?

wasn't it you that migrated from EJS to ETA?

[nebrelbug]

Haha yes it was. Actually, this file is used by https://github.com/jantimon/html-webpack-plugin, which by default uses a template engine that they call EJS but is really just lodash.template 🤷‍♂️

Maybe I should request to migrate that to Eta too 😀

[nebrelbug]

Can this change affect other sites in a bad way?

I can't say for positive, but I'm pretty sure it won't. I guess the best way is just to test the Docusaurus v2 site? The deploy preview for this PR looks good to me.

What authoritative source claims that?

Here are a few I found after a quick Google Search:

• https://developer.mozilla.org/en-US/docs/Mozilla/Mobile/Viewport_meta_tag
• https://www.w3schools.com/css/css_rwd_viewport.asp

Hopefully this PR will just fix a few edge cases like mine without negatively impacting anyone

[slorber]

So, this seems fine, let's merge, but if people complain I'll likely revert