Replace emoji icons with OS logos for Linux and Windows sections

Add RHEL technology icon (Red RGB) and Windows logo SVGs to static
assets. Update section headers to use img tags with proper sizing
instead of Unicode emoji characters.

Signed-off-by: Joseph <jvaikath@redhat.com>

Author: Joeavaikath

cmd/downloads/static/rhel-icon.svg

@@ -89,7 +89,12 @@ body {
 }
 
 .section-header .os-icon {
-  font-size: 1.1rem;
+  font-size: 1.4rem;
+}
+
+.section-header .os-logo {
+  height: 1.6rem;
+  width: auto;
 }
 
 table {

cmd/downloads/static/style.css

@@ -18,7 +18,7 @@
   <div class="container content">
     {{if .LinuxFiles}}
     <div class="section">
-      <div class="section-header"><span class="os-icon">&#128039;</span> Linux</div>
+      <div class="section-header"><img src="/static/rhel-icon.svg" alt="Red Hat Enterprise Linux" class="os-logo"> Linux</div>
       <table>
         <thead>
           <tr>
@@ -74,7 +74,7 @@
 
     {{if .WindowsFiles}}
     <div class="section">
-      <div class="section-header"><span class="os-icon">&#128187;</span> Windows</div>
+      <div class="section-header"><img src="/static/windows-logo.svg" alt="Windows" class="os-logo"> Windows</div>
       <table>
         <thead>
           <tr>