Remove 'debian' directory

This commit removes the old debian packaging information, which is
out of date.  People who wish to create Debain packages for noVNC
are better off using the package information from the actual Debian
or Ubuntu packages.

Closes #453

docs/packaging.txt

@@ -1,23 +0,0 @@
-noVNC packaging steps for Debian/Ubuntu:
-
-- Update the noVNC version in docs/VERSION and add a new entry for the
-  version in debian/changelog
-
-- Rename the novnc source directory to match the form "novnc-VERSION".
-
-- In the novnc source directory, run the packaging command:
-
-    debuild -I -uc -us
-
-    - The -I option ignores the .git directory when generating the
-      source tarball.
-    - the -uc and -us may be omitted in order to create a signed
-      package.
-
-    - Alternatively, use pbuilder instead of debuild in order to build
-      for other distributions and to guarantee a sanitized package.
-
-- Verify the package and then commit the changes to docs/VERSION and
-  debian/changelog.
-
-- Upload the new package file(s).

docs/release.txt

@@ -1,4 +1,4 @@
-- Update and commit docs/VERSION and debian/changelog
+- Update and commit docs/VERSION
 - Create version tag and tarball from tag
     WVER=0.3
     git tag v${WVER}