Remove components namespaces

Problem/Motivation

We have component namespaces defined in `civictheme.info.yml` and `civictheme_starter_kit.info.yml`

See Below:

components:
  namespaces:
    base:
      - components/00-base
    atoms:
      - components/01-atoms
    molecules:
      - components/02-molecules
    organisms:
      - components/03-organisms
    templates:
      - components/04-templates
    ct-base:
      - components/00-base
    ct-atoms:
      - components/01-atoms
    ct-molecules:
      - components/02-molecules
    ct-organisms:
      - components/03-organisms
    ct-templates:
      - components/04-templates

We do not use these anymore as we have migrated to Single Directory Components and they need to be removed.

Proposed resolution

1. Remove namespaces.