Since anonymous checks aren't created any more, don't document the manage command to clean them up.

This change allows SMTP configuration via email, but users can
still choose to configure the settings directly in local_settings.py

pip install will fail when you cannot compile some of the dependencies.
one is gcc the other is the Python.h


```
Building wheels for collected packages: rcssmin, rjsmin
  Running setup.py bdist_wheel for rcssmin ... error
  Complete output from command /home/ubuntu/webapps/hc-venv/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-ipfho29k/rcssmin/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/pip-wheel-u0q6mggl --python-tag cp36:
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.linux-x86_64-3.6
  copying ./rcssmin.py -> build/lib.linux-x86_64-3.6
  running build_ext
  building '_rcssmin' extension
  creating build/temp.linux-x86_64-3.6
  x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DEXT_MODULE=_rcssmin -UEXT_PACKAGE -I_setup/include -I/usr/include/python3.6m -I/home/ubuntu/webapps/hc-venv/include/python3.6m -c rcssmin.c -o build/temp.linux-x86_64-3.6/rcssmin.o
  unable to execute 'x86_64-linux-gnu-gcc': No such file or directory
  error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
  
  ----------------------------------------
  Failed building wheel for rcssmin
  Running setup.py clean for rcssmin
  Running setup.py bdist_wheel for rjsmin ... error
  Complete output from command /home/ubuntu/webapps/hc-venv/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-ipfho29k/rjsmin/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/pip-wheel-axnaq3w9 --python-tag cp36:
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.linux-x86_64-3.6
  copying ./rjsmin.py -> build/lib.linux-x86_64-3.6
  running build_ext
  building '_rjsmin' extension
  creating build/temp.linux-x86_64-3.6
  x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DEXT_MODULE=_rjsmin -UEXT_PACKAGE -I_setup/include -I/usr/include/python3.6m -I/home/ubuntu/webapps/hc-venv/include/python3.6m -c rjsmin.c -o build/temp.linux-x86_64-3.6/rjsmin.o
  unable to execute 'x86_64-linux-gnu-gcc': No such file or directory
  error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
```

```
  Running setup.py bdist_wheel for rjsmin ... error
  Complete output from command /home/ubuntu/webapps/hc-venv/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-cfntw7bo/rjsmin/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/pip-wheel-ytqxu9_b --python-tag cp36:
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.linux-x86_64-3.6
  copying ./rjsmin.py -> build/lib.linux-x86_64-3.6
  running build_ext
  building '_rjsmin' extension
  creating build/temp.linux-x86_64-3.6
  x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DEXT_MODULE=_rjsmin -UEXT_PACKAGE -I_setup/include -I/usr/include/python3.6m -I/home/ubuntu/webapps/hc-venv/include/python3.6m -c rjsmin.c -o build/temp.linux-x86_64-3.6/rjsmin.o
  In file included from rjsmin.c:18:0:
  _setup/include/cext.h:34:10: fatal error: Python.h: No such file or directory
   #include "Python.h"
            ^~~~~~~~~~
  compilation terminated.
```