layouts/partials/site-root.html: remove Twitter logo

Remove Twitter from the list of companies that use Git. 

Twitter is now called "X", and this logo is outdated. As logo for
Facebook removed before with git#1724 similar reason, Twitter logo
can be removed as well.

Closes: git#1983

Signed-off-by: Ahmet Can Aydemir <[email protected]>

Author: ahmetcanaydemir

assets/sass/front-page.scss

@@ -234,10 +234,6 @@ $monitor-height: 271px;
         @include background-image-2x($baseurl + "images/company-project-logos/google", 108px, 65px);
       }
 
-      &.twitter {
-        @include background-image-2x($baseurl + "images/company-project-logos/twitter", 108px, 65px);
-      }
-
       &.microsoft {
         @include background-image-2x($baseurl + "images/company-project-logos/microsoft", 108px, 65px);
       }

layouts/partials/site-root.html

@@ -62,7 +62,6 @@ <h3 class="text-center"> Companies &amp; Projects Using Git </h3>
   <ul>
     <li><a href="https://github.com/google" class="google">Google</a></li>
     <li><a href="https://github.com/Microsoft" class="microsoft">Microsoft</a></li>
-    <li><a href="https://github.com/twitter" class="twitter">Twitter</a></li>
     <li><a href="https://github.com/linkedin" class="linked-in">LinkedIn</a></li>
     <li><a href="https://github.com/netflix" class="netflix">Netflix</a></li>
     <li><a href="https://perl5.git.perl.org/perl.git" class="perl">Perl</a></li>