[SPARK-49494][DOCS] Use spark logos from spark-website in docs

### What changes were proposed in this pull request?

Use spark logos from spark-website in docs and remove them from spark main repo

### Why are the changes needed?

- reduce spark-website incremental size
- fix some cases when `/img/spark-logo-rev.svg` is invalid

### Does this PR introduce _any_ user-facing change?
no

### How was this patch tested?
doc build, https://github.com/yaooqinn/spark/actions/runs/10676269598/artifacts/1884295142

### Was this patch authored or co-authored using generative AI tooling?
no

Closes apache#47966 from yaooqinn/SPARK-49494.

Authored-by: Kent Yao <yao@apache.org>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>

docs/_layouts/global.html

@@ -58,7 +58,7 @@
         <!-- This code is taken from http://twitter.github.com/bootstrap/examples/hero.html -->
         <nav class="navbar navbar-expand-lg navbar-dark p-0 px-4 fixed-top" style="background: #1d6890;" id="topbar">
             <div class="navbar-brand"><a href="{{ rel_path_to_root }}index.html">
-                <img src="/img/spark-logo-rev.svg" width="141" height="72"/></a><span class="version">{{site.SPARK_VERSION_SHORT}}</span>
+                <img src="https://spark.apache.org/images/spark-logo-rev.svg" width="141" height="72"/></a><span class="version">{{site.SPARK_VERSION_SHORT}}</span>
             </div>
             <button class="navbar-toggler" type="button" data-toggle="collapse"
                     data-target="#navbarCollapse" aria-controls="navbarCollapse"

python/docs/source/conf.py

@@ -205,8 +205,8 @@
     "navbar_end": ["version-switcher", "theme-switcher", "navbar-icon-links"],
     "footer_start": ["spark_footer", "sphinx-version"],
     "logo": {
-        "image_light": "_static/spark-logo-light.png",
-        "image_dark": "_static/spark-logo-dark.png",
+        "image_light": "https://spark.apache.org/images/spark-logo.png",
+        "image_dark": "https://spark.apache.org/images/spark-logo-rev.svg",
     },
     "icon_links": [
         {
@@ -234,7 +234,7 @@
 
 # The name of an image file (relative to this directory) to place at the top
 # of the sidebar.
-html_logo = "../../../docs/img/spark-logo-reverse.png"
+html_logo = "https://spark.apache.org/images/spark-logo-rev.svg"
 
 # The name of an image file (within the static path) to use as a favicon of the
 # docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32