Redirect support for group index & navOrder to control left nav option

[joepavitt]

Description

• navOrder can now be set in the frontmatter for an .md file, and it will affect the order in which the page appears in the left-side navigation. The higher the number, the more priority it gets at being shown first.
• Added redirect as a frontmatter property too. This meant that we could redirect to a given child when a group (.e.g "Device Agent" is clicked, rather than having to have multiple README.md files with just a table of content. In this case we can redirect to a Getting Started or Introduction child.

Related Issue(s)

Will be opening a FF PR shortly with the first batch of docs changes that utilise these and will backlink once I've got that opened.

Checklist

• I have read the contribution guidelines
• I have considered the performance impact of these changes

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[ZJvandeWeg]

navOrder can now be set in the frontmatter for an .md file, and it will affect the order in which the page appears in the left-side navigation. The higher the number, the more priority it gets at being shown first.

I found this confusing when I read the code, when I type 1 as order, I'd expect it to go first?

[joepavitt]

I found this confusing when I read the code, when I type 1 as order, I'd expect it to go first?

That's fair, in which case, in addition to your recommended changes, we'd also need to change the order: -1 for the "Other" group catch all that's added.