docs: Update developer setup guide and refresh IDE setup screenshots

[deepakpanda93]

Describe the issue this Pull Request addresses

This PR updates the developer setup guide to ensure it reflects the latest environment configuration and dependencies. It also refreshes the IDE setup screenshots for better clarity.

Summary and Changelog

• Updated developer-setup.md with the latest installation and configuration steps.
• Replaced outdated screenshots showing IDE setup (IntelliJ).

Impact

None

Risk Level

none

Documentation Update

This PR adds new documentation content.

Contributor's checklist

• Read through contributor's guide
• Enough context is provided in the sections above
• Adequate tests were added if applicable

[xushiyan]

examine the default values for the project, like java 11 should be the new default, similar for all other versions spark, flink, scala, etc.

Review what is redundant, e.g. if the info is available in readme or not. this page should be extending what is in the readme for people to start. And readme should have a link to this page

keep intellij section to a later part, move more commonly useful sections up. there are too many screenshots for intellij section, keep less important things collapsed to make the page shorter to scroll

[deepakpanda93]

examine the default values for the project, like java 11 should be the new default, similar for all other versions spark, flink, scala, etc.

Review what is redundant, e.g. if the info is available in readme or not. this page should be extending what is in the readme for people to start. And readme should have a link to this page

keep intellij section to a later part, move more commonly useful sections up. there are too many screenshots for intellij section, keep less important things collapsed to make the page shorter to scroll

@xushiyan

• Added a Default Profile section for better clarity.
• Reordered the content to keep commonly used commands at the top for quick access.
• Moved the IntelliJ-specific configuration to a later section to improve flow.
• Removed lower-priority setup images to keep the documentation concise.

These changes aim to improve readability and overall structure of the setup guide.

[yihua]

@xushiyan @deepakpanda93 any progress on updating this PR?

[Copilot]

Pull request overview

This PR updates the developer setup guide to reflect the current environment requirements and reorganizes the documentation for better clarity. The changes include updating Java version requirements, adding a new default build profiles section, and restructuring the IntelliJ IDE setup instructions using collapsible sections.

Key Changes:

• Updated Java requirement from JDK 8 to JDK 11, and default Spark profile from 3.2 to 3.5
• Added a new "Default Build Profiles" table summarizing Spark 3.5, Scala 2.12, Java 11, and Flink 1.20 as defaults
• Reorganized IntelliJ setup instructions into collapsible sections and moved them after the code walkthrough section for better flow

Reviewed changes

Copilot reviewed 1 out of 14 changed files in this pull request and generated no comments.

File	Description
website/contribute/developer-setup.md	Updated system requirements, default build profiles, Maven command examples, and reorganized IDE setup instructions with collapsible sections for better readability
website/static/assets/images/contributing/IDE_setup_java.png	Refreshed screenshot showing Java 11 configuration in IntelliJ Project Structure

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