Direction and maturity updates for Helm

Why is this change being made?

This MR updates the direction page for the Helm Chart Registry and its maturity target date. This was pushed back because the current planned implementation is blocked.

Does this MR meet the acceptance criteria?

Assign to DRI

• Did you assign this change to the correct DRI of the page or information you are changing?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what