specifications: remove sidecar policy artifacts

SPECIFICATIONS.md

@@ -1,3 +0,0 @@
-# Specifications
-
-The authoritative Kaptan specification policy is [libs/kaptan-spec/src/lib.spec.md](libs/kaptan-spec/src/lib.spec.md).

boards/kakute-f7-mini-v3/src/main.spec.md

@@ -1,10 +0,0 @@
-# --- version: 0.1.0 ---
-
----
-title: Kaptan Support for Kakute F7 Mini V3
-status: in-progress
-owners:
-  - Onur Özkan <work@onurozkan.dev>
----
-
-## TODO

libs/kaptan-mavlink/src/lib.spec.md

@@ -1,10 +0,0 @@
-# --- version: 0.1.0 ---
-
----
-title: MAVLink Support for Kaptan
-status: in-progress
-owners:
-  - Onur Özkan <work@onurozkan.dev>
----
-
-## TODO