Improve the state of Basilisp documentation

[chrisrink10]

Fixes #254
Fixes #252
Fixes #251

[chrisrink10]

"Fix" this error I was seeing in CircleCI with PyPy 3.6:

pypy3 inst-nodeps: /root/project/.tox/.tmp/package/1/basilisp-0.1.0a1.tar.gz
ERROR: invocation failed (exit code 1), logfile: /root/project/.tox/pypy3/log/pypy3-4.log
================================== log start ===================================
/root/project/.tox/pypy3/site-packages/_distutils_hack/__init__.py:30: UserWarning: Setuptools is replacing distutils.
  warnings.warn("Setuptools is replacing distutils.")
Traceback (most recent call last):
  File "/opt/pypy/lib-python/3/runpy.py", line 196, in _run_module_as_main
    "__main__", mod_spec)
  File "/opt/pypy/lib-python/3/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/root/project/.tox/pypy3/site-packages/pip/__main__.py", line 29, in <module>
    from pip._internal.cli.main import main as _main
  File "/root/project/.tox/pypy3/site-packages/pip/_internal/cli/main.py", line 9, in <module>
    from pip._internal.cli.autocompletion import autocomplete
  File "/root/project/.tox/pypy3/site-packages/pip/_internal/cli/autocompletion.py", line 10, in <module>
    from pip._internal.cli.main_parser import create_main_parser
  File "/root/project/.tox/pypy3/site-packages/pip/_internal/cli/main_parser.py", line 8, in <module>
    from pip._internal.cli import cmdoptions
  File "/root/project/.tox/pypy3/site-packages/pip/_internal/cli/cmdoptions.py", line 23, in <module>
    from pip._internal.cli.parser import ConfigOptionParser
  File "/root/project/.tox/pypy3/site-packages/pip/_internal/cli/parser.py", line 12, in <module>
    from pip._internal.configuration import Configuration, ConfigurationError
  File "/root/project/.tox/pypy3/site-packages/pip/_internal/configuration.py", line 20, in <module>
    from pip._internal.exceptions import (
  File "/root/project/.tox/pypy3/site-packages/pip/_internal/exceptions.py", line 14, in <module>
    from pip._vendor.rich.console import Console, ConsoleOptions, RenderResult
  File "/root/project/.tox/pypy3/site-packages/pip/_vendor/rich/console.py", line 7, in <module>
    from dataclasses import dataclass, field
ModuleNotFoundError: No module named 'dataclasses'

=================================== log end ====================================
___________________________________ summary ____________________________________
ERROR:   pypy3: InvocationError for command /root/project/.tox/pypy3/bin/python -m pip install --no-deps -U .tox/.tmp/package/1/basilisp-0.1.0a1.tar.gz (exited with code 1)