chore: drop extra dependencies

We only really care about a handful of dependencies, and the rest can be auto-installed by rtd.

Author: josegonzalez

docs/requirements.txt

@@ -1,19 +1,4 @@
-alabaster==0.7.14
-Babel==2.16.0
-certifi==2024.8.30
-chardet==5.2.0
-docutils==0.21.2
-idna==3.10
-imagesize==1.4.1
-Jinja2==3.1.4
-MarkupSafe==2.1.5
 Pygments==2.18.0
-pytz==2024.2
-requests==2.32.3
-six==1.16.0
-snowballstemmer==2.2.0
 Sphinx==7.4.7
 sphinx-rtd-theme==2.0.0
-sphinxcontrib-phpdomain==0.12.0
-urllib3==2.2.3
 cakephp-theme