Adds a read the docs config file

[alexhroom]

Fixes issues caused by https://github.com/readthedocs/readthedocs.org/issues/10290. originally part of #1419.

[alexhroom]

how weird. a few issues: on the CI,

 ERROR: test_normalized_parameters (axelrod.tests.strategies.test_cycler.TestEvolvableCycler)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "D:\a\Axelrod\Axelrod\axelrod\tests\strategies\test_cycler.py", line 177, in test_normalized_parameters
    self.player_class(cycle=cycle, seed=1)._normalize_parameters(
  File "D:\a\Axelrod\Axelrod\axelrod\player.py", line 65, in __call__
    obj = type.__call__(cls, *args, **kwargs)
  File "D:\a\Axelrod\Axelrod\axelrod\strategies\cycler.py", line 119, in __init__
    cycle, cycle_length = self._normalize_parameters(cycle, cycle_length)
  File "D:\a\Axelrod\Axelrod\axelrod\strategies\cycler.py", line 132, in _normalize_parameters
    raise InsufficientParametersError(
axelrod.evolvable_player.InsufficientParametersError: Insufficient Parameters to instantiate EvolvableCycler

despite this PR not changing anything in the actual code base.

also, the read the docs build failing despite me literally copying the files exactly from the successful #1419 setup

[drvinceknight]

also, the read the docs build failing despite me literally copying the files exactly from the successful #1419 setup

Here's the failure traceback on rtd:

$ python -m pip install --exists-action=w --no-cache-dir -r docs/requirements.txt
Collecting docutils<=0.17 (from -r docs/requirements.txt (line 1))
  Downloading docutils-0.17-py2.py3-none-any.whl (575 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 575.1/575.1 kB 93.6 MB/s eta 0:00:00
ERROR: Ignored the following versions that require a different python version: 1.22.0 Requires-Python >=3.8; 1.22.1 Requires-Python >=3.8; 1.22.2 Requires-Python >=3.8; 1.22.3 Requires-Python >=3.8; 1.22.4 Requires-Python >=3.8; 1.23.0 Requires-Python >=3.8; 1.23.0rc1 Requires-Python >=3.8; 1.23.0rc2 Requires-Python >=3.8; 1.23.0rc3 Requires-Python >=3.8; 1.23.1 Requires-Python >=3.8; 1.23.2 Requires-Python >=3.8; 1.23.3 Requires-Python >=3.8; 1.23.4 Requires-Python >=3.8; 1.23.5 Requires-Python >=3.8; 1.24.0 Requires-Python >=3.8; 1.24.0rc1 Requires-Python >=3.8; 1.24.0rc2 Requires-Python >=3.8; 1.24.1 Requires-Python >=3.8; 1.24.2 Requires-Python >=3.8; 1.24.3 Requires-Python >=3.8
ERROR: Could not find a version that satisfies the requirement numpy==1.24.3 (from versions: 1.3.0, 1.4.1, 1.5.0, 1.5.1, 1.6.0, 1.6.1, 1.6.2, 1.7.0, 1.7.1, 1.7.2, 1.8.0, 1.8.1, 1.8.2, 1.9.0, 1.9.1, 1.9.2, 1.9.3, 1.10.0.post2, 1.10.1, 1.10.2, 1.10.4, 1.11.0, 1.11.1, 1.11.2, 1.11.3, 1.12.0, 1.12.1, 1.13.0, 1.13.1, 1.13.3, 1.14.0, 1.14.1, 1.14.2, 1.14.3, 1.14.4, 1.14.5, 1.14.6, 1.15.0, 1.15.1, 1.15.2, 1.15.3, 1.15.4, 1.16.0, 1.16.1, 1.16.2, 1.16.3, 1.16.4, 1.16.5, 1.16.6, 1.17.0, 1.17.1, 1.17.2, 1.17.3, 1.17.4, 1.17.5, 1.18.0, 1.18.1, 1.18.2, 1.18.3, 1.18.4, 1.18.5, 1.19.0, 1.19.1, 1.19.2, 1.19.3, 1.19.4, 1.19.5, 1.20.0, 1.20.1, 1.20.2, 1.20.3, 1.21.0, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6)
ERROR: No matching distribution found for numpy==1.24.3

[alexhroom]

my bad - i mistakenly put the yaml in the docs/ directory rather than the root directory.

[marcharper]

LGTM