[website] update roadmap to account latest requirements

[MehulBatra]

Purpose

Linked issue: #1203

Update roadmap to reflect v0.8 features, timeline, and latest project additions.

Brief change log

• Added "Fluss Server" section for HA, cluster operations, and optimizations
• Added Streaming Lakehouse production-ready features and Lance support
• Added Spark connector, Python client, and Helm charts sections
• Updated Java version from 17 to 11
• Reorganized Flink integration with system tables support
• Added GitHub issue references and milestone board link

Tests

None

API and Format

None

Documentation

Yes. Enhanced roadmap with v0.8 features, timeline, and improved organization for better project visibility.

[MehulBatra]

@wuchong @polyzos When you have some time, could you please take a look at this PR? Thank you!

[wuchong]

In my opinion, the project roadmap should not serve as an issue tracker. Instead, it should provide a high-level overview that’s easy to understand — even for users who are not yet familiar with Fluss. That means we don’t need to list every detailed issue here (which may be hard to grasp at a glance). Interested users can refer to the corresponding milestone for full tracking details.

Also, there are currently too many bolded items, which dilutes the visual emphasis. I suggest using only H2 headings , and removing H3s and bold formatting for issue titles to improve readability and focus.

What do you think?

[MehulBatra]

I completely agree, I had this same thought but I let it die. You're right that current roadmap is too granular and closely tied to version 0.8 specifics rather than presenting a clear, high-level vision. I'll rework it to be more concise and strategic, focusing on the big picture that newcomers can easily grasp. I'll also streamline the formatting as you suggested.
Thank you for the feedback!

[MehulBatra]

@wuchong Please have a look, I have try to modify it as discussed above in a more condensed way.

[polyzos]

LGTM

[MehulBatra]

Thanks @polyzos @wuchong for the review!