DOC: Simplify footer by removing custom template and integrating sponsor information directly into copyright

- Deleted the custom "pandas_footer.html" template.
- Updated copyright statement in conf.py to include sponsor information.
- Removed related CSS styles for the footer sponsors.

Author: Siryoos

doc/_templates/pandas_footer.html

@@ -57,7 +57,3 @@ table {
   align-items: center;
   gap: 0.5rem;
 }
-
-.footer-sponsors {
-  display: inline-block;
-}

doc/source/_static/css/pandas.css

@@ -163,8 +163,8 @@
 
 # General information about the project.
 project = "pandas"
-# We have our custom "pandas_footer.html" template, using copyright for the current year
-copyright = f"{datetime.now().year}, pandas"
+# Updated copyright to include sponsor information, removing the need for custom template
+copyright = f'{datetime.now().year}, pandas via <a href="https://numfocus.org">NumFOCUS, Inc.</a> Hosted by <a href="https://www.ovhcloud.com">OVHcloud</a>.'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -242,7 +242,7 @@
 
 html_theme_options = {
     "external_links": [],
-    "footer_start": ["copyright", "pandas_footer", "sphinx-version"],
+    "footer_start": ["copyright", "sphinx-version"],
     "github_url": "https://github.com/pandas-dev/pandas",
     "analytics": {
         "plausible_analytics_domain": "pandas.pydata.org",