(DOCSP-39533): Consolidate Add Sync to an App page

[dacharyc]

Pull Request Info - SDK Docs Consolidation

Jira ticket: https://jira.mongodb.org/browse/DOCSP-39533

Staged Page

• Add Sync to an App

Note for reviewer: some of the API descriptions are intentionally missing because there isn't necessarily anything else relevant to add.

Page Source

Add links to every SDK's pages where you got the SDK-specific information:

• Flutter: Add Sync to an App
• Kotlin: Add Sync to an App
• .NET: Add Sync to an App
• Swift: Add Sync to an App

PR Author Checklist

Before requesting a review for your PR, please check these items:

• Open the PR against the feature-consolidated-sdk-docs branch instead of master
• Tag the consolidated page for:
  • genre
  • meta.keywords
  • meta.description

Naming

• Update Realm naming and the language around persistence layer/local/device per this document
• Include .rst files comply with the naming guidelines

Links and Refs

• Create new consolidated SDK ref targets starting with "_sdks-" for relevant sections
• Remove or update any SDK-specific refs to use the new consolidated SDK ref targets
• Update any Kotlin API links to use the new Kotlin SDK roles

Content

• Shared code boxes have snippets or placeholders for all 9 languages
• API description sections have API details or a generic placeholder for all 9 languages
• Check related pages for relevant content to include
• Create a ticket for missing examples in each relevant SDK: Consolidation Gaps epic

Reviewer Checklist

As a reviewer, please check these items:

• Shared code example boxes contain language-specific snippets or placeholders for every language
• API reference details contain working API reference links or generic content
• Realm naming/language has been updated
• All relevant content from individual SDK pages is present on the consolidated page

[netlify]

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[github-actions]

Readability for Commit Hash: 733357d

You can see any previous Readability scores (if they exist) by looking
at the comment's history.

Readability scores for changed documents:

• source/sdk/sync/add-sync-to-app: Grade Level: 8.1, Reading Ease: 64.41
• source/sdk/crud/threading: Grade Level: 9.2, Reading Ease: 40.01

For Grade Level, aim for 8 or below.

For Reading Ease scores, aim for 60 or above:

Score	Difficulty
90-100	Very Easy
80-89	Easy
70-79	Fairly Easy
60-69	Medium
50-59	Fairly Hard
30-49	Hard
0-29	Very Hard

For help improving readability, try Hemingway App.

[docs-builder-bot]

✨ Staging URL: https://preview-mongodbmongodb.gatsbyjs.io/realm/feature-consolidated-sdk-docs/

🪵 Logs

• job log: c92d7f9ee362a9221445cb30fbbcb95386f9973a