Added canonical links for articles.

homepage/views/articles/article.pug

@@ -2,6 +2,7 @@ extends ../base.pug
 
 block head
     link(href='/assets/css/articles.css' rel='stylesheet')
+    block head_ext
 
 block nav
     nav

homepage/views/articles/nginx_recipes_and_tips.pug

@@ -1,5 +1,8 @@
 extends article.pug
 
+block head_ext
+	link(rel='canonical' href='https://arav.top/stuff/article/nginx_recipes_and_tips')
+
 block article
 	header
 		h2 NGiNX's recipes & tips

homepage/views/articles/rpi_root_on_external_drive.pug

@@ -1,5 +1,8 @@
 extends article.pug
 
+block head_ext
+	link(rel='canonical' href='https://arav.top/stuff/article/rpi_root_on_external_drive')
+
 block article
 	header
 		h2 How to move a root from SD card to external drive on Raspberry Pi

homepage/views/articles/setting_up_a_mail_server.pug

@@ -1,5 +1,8 @@
 extends article.pug
 
+block head_ext
+	link(rel='canonical' href='https://arav.top/stuff/article/setting_up_a_mail_server')
+
 block article
 	header
 		h2 Setting up a mail server (WIP)

homepage/views/articles/setting_up_a_tor_proxy_relay_hiddenserv.pug

@@ -1,5 +1,8 @@
 extends article.pug
 
+block head_ext
+	link(rel='canonical' href='https://arav.top/stuff/article/setting_up_a_tor_proxy_relay_hiddenserv')
+
 block article
 	header
 		h2 Setting up a Tor proxy, relay and hidden service