conf: Add sphinx_rtd_theme to extensions, remove env based import #206
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The RTD build failed with "NameError: name 'html_theme' is not defined".
Remove the conditional import and align to what Spicy and the sphinx_rtd_theme docs [1] indicate should be done.
[1] https://sphinx-rtd-theme.readthedocs.io/en/stable/installing.html
RTD build: https://readthedocs.org/projects/zeek-docs/builds/21704944/