Update roadmap docs

Point to the more detailed planning process.
Remove future items list and point to the eh repo.

Signed-off-by: Maayan Friedman <maafried@redhat.com>

src/content/community/roadmap/_index.en.md

@@ -8,31 +8,22 @@ Submariner organizes all current and upcoming work using GitHub Issues, Projects
 
 ## Planning Process
 
-In preparation for sprint planning meetings (see [Submariner's Community Calendar][cal]), GitHub Issues should be raised for work that is to
-be a part of a sprint. Issues targeted for a sprint should be added to the upcoming Project's "Backlog" column. During sprint planning
-meetings, Issues will be discussed and moved to the "TODO" column and the milestone will be set to the targeted release. As contributors
-make progress during sprints, Issues should be moved through the "In Progress"/"Review/Verify"/"Done" columns of the Project. If an Issue is
-implemented during a release but additional work (like an ACK-fixed verification) tracked by the relevant Issue is necessary, the Issue can
-be carried over to the next Project but the Milestone should reflect where the code was shipped for accurate release note creation.
+For a detailed explanation of Submariner planning process, see [Submariner's Contribution Guide][contributing].
 
 ## Current Work
 
 Current and near-future work is tracked by [Submariner's open Projects][projects].
 
 ## Future Work
 
-Some high-level goals are summarized here, but the primary source for tracking future work are Submariner's GitHub Issues.
-
-* Network Policy across clusters (Coastguard)
-* Support for finer-grained connectivity policies (<https://github.com/submariner-io/enhancements/pull/4/files>)
-* Dynamic routing with BGP to support multi-path forwarding across gateways
-* Testing with multi-cluster Istio
-* Scale improvements
+Future work which is not planned for the current release can be found in the [backlog board] and the [enhancements] repository.
 
 ## Suggesting Work
 
 If we are missing something that would make Submariner more useful to you, please let us know. The best way is to file an Issue and include
 information on how you intend to use Submariner with that feature.
 
-[cal]: https://calendar.google.com/calendar/r?cid=NHFuZGVoOGY0bzZ1ajlvZnBsczh1NWNlZ2tAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ
 [projects]: https://github.com/orgs/submariner-io/projects
+[contributing]: https://submariner.io/development/contribution-guide/
+[enhancements]: https://github.com/submariner-io/enhancements/issues
+[backlog board]: https://github.com/orgs/submariner-io/projects/29/views/1