Fix the docs build on ReadTheDocs

Author: Gallaecio

docs/requirements.txt

@@ -1,2 +1,3 @@
+scrapy
 Sphinx==8.1.3
 sphinx-rtd-theme==3.0.1

tox.ini

@@ -38,14 +38,10 @@ deps =
     web-poet==0.14.0
     zyte-parsers==0.5.0
 
-[extra]
-deps =
-    scrapy
-
 [testenv:extra]
 deps =
     {[base]deps}
-    {[extra]deps}
+    scrapy
 commands =
     pytest \
         --cov-report=term-missing:skip-covered \
@@ -67,7 +63,6 @@ deps =
 changedir = docs
 deps =
     -rdocs/requirements.txt
-    {[extra]deps}
 setenv =
     READTHEDOCS_PROJECT=zyte-common-items
     READTHEDOCS_VERSION=main