RTD: Fix GA Integration

GA was dropped from RTD in early Oct, 2024. This adds it again.

Author: ax3l

docs/requirements.txt

@@ -10,5 +10,6 @@ sphinx>=5.3,<7.2
 sphinx-copybutton
 sphinx-design
 sphinx_rtd_theme>=1.1.1
+sphinxcontrib-googleanalytics
 sphinxcontrib-svg2pdfconverter
 sphinxcontrib.programoutput

docs/source/conf.py

@@ -41,13 +41,18 @@
               'breathe',
               'sphinx_copybutton',
               'sphinx_design',
+              'sphinxcontrib.googleanalytics',
               'sphinxcontrib.programoutput',
               'sphinxcontrib.rsvgconverter',
               'matplotlib.sphinxext.plot_directive']
 
 if not on_rtd:
     extensions.append('sphinx.ext.githubpages')
 
+# Google Analytics
+googleanalytics_id = "G-3P1ZT3SQQ5"
+googleanalytics_enabled = True
+
 # breathe config
 breathe_projects = {'openPMD-api': '../xml'}
 breathe_default_project = 'openPMD-api'