chore: add Sphinx build dependencies file

Author: popescu-v

.github/workflows/docs.yaml

@@ -2,6 +2,12 @@
 name: Docs
 on:
   workflow_dispatch:
+    inputs:
+      deploy-gh-pages:
+        description: Deploy to GH Pages
+        required: true
+        type: boolean
+        default: false
   pull_request:
     paths:
       - docs/**.rst

docs/requirements.txt

@@ -0,0 +1,9 @@
+sphinx>=6.1.0
+furo>=2022.12.7
+ipykernel>=6.9.1
+nbconvert==6.4.4
+nbformat==5.3.0
+numpy
+matplotlib
+numpydoc>=1.5.0
+sphinx-copybutton>=0.5.0