fix: Fix HTML validation warnings

Makefile

@@ -21,15 +21,5 @@ build:
 		-v build_time="${BUILD_DATE}" \
 		--assets ./assets \
 		--copy-assets \
-		--ignore assets/img/raw \
-		--include robots.txt \
-		--blog \
-		--rss
-	python ../shared-assets/pgp-sign.py $(wildcard _site/*.html)
-	gpg \
-		--armor \
-		--output _site/assets/files/verify.sh.sig \
-		--local-user papatutuwawa@polynom.me \
-		--detach-sign \
-		assets/files/verify.sh
+		--include robots.txt
 	tar -czf blog.tar.gz _site

layout/page.html

@@ -19,7 +19,7 @@
     <div class="horizontal-center">
       <div class="vertical header">
 	<div id="header" class="horizontal">
-	  <img class="avatar" src="{{ page_assets }}/img/avatar.jpg" />
+	  <img class="avatar" src="{{ page_assets }}/img/avatar.jpg" alt="" />
 
 	  <div class="vertical-center">
 	    <span class="name-title">Alexander "PapaTutuWawa"</span>
@@ -39,12 +39,13 @@
 
 	<br />
 
-	<center class="footer">
+	<div class="horizontal-center footer">
 	  Created by <i>PapaTutuWawa</i> with &lt;3 using
 	  <a href="https://github.com/google/roboto">Roboto</a>,
 	  <a href="https://github.com/RedHatOfficial/Overpass">Overpass</a> and
 	  <a href="https://github.com/sunainapai/makesite">makesite</a>
-	</center>
+	</div>
+      </div>
     </div>
   </body>
 </html>

layout/templates/screenshot.html

@@ -1,5 +1,5 @@
 <div>
   <a href="https://{{ item.source_url }}" target="_blank">
-    <img class="screenshot clickable" src="{{ item.screenshot }}" />
+    <img class="screenshot clickable" src="{{ item.screenshot }}" alt="Screenshot of {{ item.title }}" />
   </a>
 </div>