Remove edx4edx LMS env settings

Is this used? It contains MITx references.

lms/envs/edx4edx_aws.py

-# We intentionally define lots of variables that aren't used, and
-# want to import all variables from base settings files
-# pylint: disable=wildcard-import, unused-wildcard-import
-
-# Settings for edx4edx production instance
-from .aws import *
-COURSE_NAME = "edx4edx"
-COURSE_NUMBER = "edX.01"
-COURSE_TITLE = "edx4edx: edX Author Course"
-EDX4EDX_ROOT = ENV_ROOT / "data/edx4edx"
-
-### Dark code. Should be enabled in local settings for devel.
-ENABLE_MULTICOURSE = True   # set to False to disable multicourse display (see lib.util.views.edxhome)
-###
-PIPELINE_CSS_COMPRESSOR = None
-PIPELINE_JS_COMPRESSOR = None
-
-COURSE_DEFAULT = 'edx4edx'
-COURSE_SETTINGS = {
-    'edx4edx': {
-        'number': 'edX.01',
-        'title': 'edx4edx: edX Author Course',
-        'xmlpath': '/edx4edx/',
-        'github_url': 'https://github.com/MITx/edx4edx',
-        'active': True,
-        'default_chapter': 'Introduction',
-        'default_section': 'edx4edx_Course',
-    },
-}
-
-STATICFILES_DIRS = [
-    PROJECT_ROOT / "static",
-    ("edx4edx", EDX4EDX_ROOT / "html"),
-    ("circuits", DATA_DIR / "images"),
-    ("handouts", DATA_DIR / "handouts"),
-    ("subs", DATA_DIR / "subs"),
-
-    # This is how you would use the textbook images locally
-    # ("book", ENV_ROOT / "book_images"),
-]
-
-MAKO_TEMPLATES['course'] = [DATA_DIR, EDX4EDX_ROOT]