Rename top folder 'crds' into 'examples'

- mostly rename 'crds' into 'examples' and thus replace 'crds/examples'
  with 'examples/tracingpolicy' and simplify other directory structure
  under 'examples'.
- fix all the links available in the repository from docs and code to
  point to the new 'examples' hierarchy instead of the old ones.
- move the configuration dir struct example from 'docs/configuration' to
  'examples/configuration'.
- remove the symbolic link to the CRD definition yaml.
- update the README of the new 'examples' folder.

Signed-off-by: Mahe Tardy <[email protected]>

Author: mtardy