Deleting legacy templates.

playbooks/roles/edxapp/templates/lms-preview.auth.json.j2

-{% do lms_auth_config.update(EDXAPP_AUTH_EXTRA) %}
-{{ lms_preview_auth_config | to_nice_json }}

playbooks/roles/edxapp/templates/lms-preview.conf.j2

-[program:lms-preview]
-{% if ansible_processor|length > 0 %}
-command={{ edxapp_venv_dir }}/bin/gunicorn --preload -b {{ edxapp_lms_preview_gunicorn_host }}:{{ edxapp_lms_preview_gunicorn_port }} -w {{ ansible_processor|length * worker_core_mult.lms_preview }} --timeout=300 --pythonpath={{ edxapp_code_dir }} lms.wsgi
-{% else %}
-command={{ edxapp_venv_dir }}/bin/gunicorn --preload -b {{ edxapp_lms_preview_gunicorn_host }}:{{ edxapp_lms_preview_gunicorn_port }} -w {{ worker_core_mult.lms_preview }} --timeout=300 --pythonpath={{ edxapp_code_dir }} lms.wsgi
-{% endif %}
-
-user={{ common_web_user }}
-directory={{ edxapp_code_dir }}
-environment=PORT={{edxapp_lms_gunicorn_port}},ADDRESS={{edxapp_lms_gunicorn_host}},LANG={{ EDXAPP_LANG }},DJANGO_SETTINGS_MODULE={{ edxapp_lms_env }},SERVICE_VARIANT="lms-preview"
-stdout_logfile={{ supervisor_log_dir }}/%(program_name)-stdout.log
-stderr_logfile={{ supervisor_log_dir }}/%(program_name)-stderr.log
-killasgroup=true
-stopasgroup=true

playbooks/roles/edxapp/templates/lms-preview.env.json.j2

-{% do lms_preview_env_config.update(EDXAPP_ENV_EXTRA) %}
-{% if EDXAPP_UPDATE_STATIC_FILES_KEY %}
-  {%- do lms_preview_env_config['CACHES']['staticfiles'].update({'KEY_PREFIX': edxapp_dynamic_cache_key}) %}
-{% endif %}
-{{ lms_preview_env_config | to_nice_json }}