Housekeeping: move adrs/ to docs/ and update status (#2443)

Co-authored-by: Francesco Renzi <rentziass@github.com>

docs/adrs/yyyy-mm-dd-TEMPLATE.md

@@ -0,0 +1,18 @@
+# Title
+
+<!-- ADR titles should typically be imperative sentences. -->
+
+**Status**: (Proposed|Accepted|Rejected|Superceded|Deprecated)
+
+## Context
+
+_What is the issue or background knowledge necessary for future readers
+to understand why this ADR was written?_
+
+## Decision
+
+_**What** is the change being proposed? **How** will it be implemented?_
+
+## Consequences
+
+_What becomes easier or more difficult to do because of this change?_