Update DDEV instructions, to use Composer in DDEV only

[gitressa]

What does this change?

• Fixes Update DDEV instructions, so users are not required to have PHP and Composer installed on the host system #341

See also DDEV issue:

• Update DDEV instructions for LocalGov to use DDEV Composer only ddev/ddev#7926

Getting started

• The order of options is reversed, so that the classic LAMP method, is placed last, as "2. Using your machine's native technologies".
• Since there are now different recommendations for each OS, the Docker Desktop mentions have been removed.

Working with DDEV

A total re-write, most importantly:

• The method has been updated to use Composer in DDEV only.
• Installation instructions have been replaced with links to the DDEV instructions, to prevent outdated info.
• Links have been updated.
• The LocalGov Demo module is now mentioned.

How to test

Check the updated instructions and text on the pages, and verify following them results in a working LGD installation in DDEV.

How can we measure success?

Same as above.

Have we considered potential risks?

There shouldn't be any.

Images

Accessibility

• Tested with screen reader
• Navigable with keyboard
• Colour contrast passed
• The change doesn't use only colour to convey meaning

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[rfay]

I haven't used localgov, but made a couple of comments to update this.

Overall, it looks like way too many words to get the job done. I think people might stumble over so much text. I'm pretty sure this is very simple and straightforward and can be described more tersely.

I don't think there needs to be any apology or defense of switching to a standard technique like DDEV or Lando, and there's not really a reason to be talking much about the docker provider, as that's more of less invisible to the user. And I would think people would already be there by now, I don't know.

It seems like this has probably been ignored for a really long time or it wouldn't still be written like this. I think it was already way too wordy, probably too many cooks in the kitchen on it.

[gitressa]

Thanks @rfay, great suggestions. And I do agree that the instruction is far too wordy, but I decided to stay focused on getting the process right.

We can always create a "tighten up DDEV instructions" as a follow up :)