change alt-texts for timeline page

Author: DragonSenseiGuy

pydis_site/apps/timeline/entries/2018-02-03_our-logo-is-born.md

@@ -5,5 +5,5 @@ icon: pydis
 ---
 
 <p style="background-color: #7289DA; border-radius: 10px;">
-  <img style="padding-right: 20px;" src="https://raw.githubusercontent.com/python-discord/branding/main/logos/logo_banner/logo_site_banner.svg">
+  <img style="padding-right: 20px;" src="https://raw.githubusercontent.com/python-discord/branding/main/logos/logo_banner/logo_site_banner.svg" alt="Python Discord Logo">
 </p>

pydis_site/templates/timeline/timeline.html

@@ -17,7 +17,7 @@
         <div class="timeline-icon-date">
           <div class="timeline-icon {{ entry.icon_color }}">
             {% if entry.icon == "pydis" %}
-              <img class="pydis" src="{% static "images/timeline/cd-icon-pydis.svg" %}" alt="Logo">
+              <img class="pydis" src="{% static "images/timeline/cd-icon-pydis.svg" %}" alt="">
             {% else %}
               <span class="icon"><i class="{{ entry.icon }}"></i></span>
             {% endif %}