Update art on landing pages

[MongoCaleb]

Pull Request Info - SDK Docs Consolidation

Jira ticket: https://jira.mongodb.org/browse/DOCSP-40472

Staged Pages

• CPP
• DOTNET
• FLUTTER
• JAVA
• NODE
• KOTLIN
• REACT NATIVE

Release Notes

• Landing Pages
  • Update illustrations for 2024 branding/dark mode.

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[github-actions]

Readability for Commit Hash: 3715cad

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

Readability scores for changed documents:

• source/sdk/flutter: Grade Level: 9.5, Reading Ease: 50.02
• source/sdk/react-native: Grade Level: 10.9, Reading Ease: 40.95
• source/sdk/swift: Grade Level: 9.4, Reading Ease: 50.12
• source/sdk/kotlin: Grade Level: 9.2, Reading Ease: 50.63
• source/sdk/java: Grade Level: 9.1, Reading Ease: 51.04
• source/sdk/dotnet: Grade Level: 9.1, Reading Ease: 51.04
• source/sdk/node: Grade Level: 8.6, Reading Ease: 52.15
• source/sdk/cpp: Grade Level: 9.1, Reading Ease: 50.94

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.

[krollins-mdb]

LGTM, but can you add a little blurb about the changes to the PR description for the release notes? Thanks, @MongoCaleb!

[docs-builder-bot]

✨ Staging URL: https://preview-mongodbmongodb.gatsbyjs.io/realm/master/

🪵 Logs

• job log: 96c86ed8cddad4001f438f7727a495752900e60e