drop signing

debian/README.source

@@ -267,30 +267,3 @@ linux-source-<version> binary package.  Currently kernel builds use
 debian/build/build_<arch>_<featureset>_<flavour>, userland code uses
 debian/build/build-tools/<source-dir> and documentation uses
 debian/build/build-doc.
-
-Code signing
-============
-
-The kernel image and modules may be signed after building, to support
-a Secure Boot or Trusted Boot policy.  In Debian, this is performed by
-a "code signing service" that is separate from the normal package
-build process.
-
-The initial package build generates binary packages named
-linux-image-<arch>-signed-template, that contain a source package
-template and metadata about the files to be signed.  The code signing
-service will download this and the linux-image packages to be signed.
-It will add detached signatures to the source package, then upload it
-(without ever running debian/rules).
-
-The source package template is generated by
-debian/bin/gencontrol_signed.py and debian/rules.real with files from
-debian/signing_templates and debian/templates.  To test changes to
-these:
-
-1. Build the linux source package.
-2. Generate the signed source package by running the script
-   "debian-test-sign" from the kernel-team.git repository.  It is
-   also possible to set up a development configuration of the
-   official code signing service, but this is more complicated.
-3. Build the signed source package.