docs: add ADR-7

[xopham]

Fixes no issue

Description

• adds ADR-7 to the docs page
• minor change without any implications

Checklist

• PR is rebased to/aimed at branch develop
• PR follows Contributing Guide
• Added tests (if necessary)
• Extended README/Documentation (if necessary)
• Adjusted versions of image and Helm chart in values.yaml and Chart.yaml (if necessary)

[codecov-commenter]

Codecov Report

Merging #406 (031b89c) into develop (cf8cc75) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #406   +/-   ##
========================================
  Coverage    94.24%   94.24%           
========================================
  Files           22       22           
  Lines         1095     1095           
========================================
  Hits          1032     1032           
  Misses          63       63           

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