Added docs on service registration options in 17.3

[AndyButland]

📋 Description

Adds details on start-up options for Umbraco, selectively registering services for the different features supported by the CMS.

📎 Related Issues (if applicable)

Relates to PR umbraco/Umbraco-CMS#21630 resolving issue umbraco/Umbraco-CMS#21622.

✅ Contributor Checklist

I've followed the Umbraco Documentation Style Guide and can confirm that:

• Code blocks are correctly formatted.
• Sentences are short and clear (preferably under 25 words).
• Passive voice and first-person language (“we”, “I”) are avoided.
• Relevant pages are linked.
• All links work and point to the correct resources.
• Screenshots or diagrams are included if useful.
• Any code examples or instructions have been tested.
• Typos, broken links, and broken images are fixed.

Product & Version (if relevant)

CMS 17.3

Deadline (if relevant)

Should be published along with the release of the RC for 17.3, which is scheduled for 19th March.

[sofietoft]

I have concerns (and ideas!) about the table under "Supported Configurations".
I agree that it makes sense to add this kinda info into a table, however, this is how the current setup looks:

It's a little too condensed.
I've tried out a couple of alternatives (currently mostly leaning towards option 2):

Option 1

The table has vertical scrolling, which is great, but also not so great 🤔

Option 2

Separates Use Cases from the table, but the table looks cleanest in this view, if you ask me.

What do you think?

[AndyButland]

Option 2 looks nice to me. Just not sure about the "Learn how to..." sentence that's been added in the use case.

[sofietoft]

Yeah, I think I mistakenly copied something from my clipboard when I went to get the screenshot 😂

Let's go for option 2 then.
I'll set it up on GitBook (just easier!) after this has been merged in a couple of weeks. Will sent you a preview before I publish the changes.