Added rel='canonical' to all pages.

web/templates/about.pug

@@ -5,6 +5,7 @@ block meta_description
 
 block append head
     link(href='/assets/css/about.css' rel='stylesheet')
+    link(rel='canonical' href='/about')
 
 block nav
     a(href='/') Home

web/templates/guestbook.pug

@@ -12,6 +12,7 @@ block meta_description
 block append head
     link(href='/assets/css/guestbook.css' rel='stylesheet')
     script(src='/assets/js/captcha_refresh.js' defer='')
+    link(rel='canonical' href='/guestbook')
 
 block nav
     a(href='/') Home

web/templates/index.pug

@@ -5,6 +5,7 @@ block meta_description
 
 block append head
     link(href='assets/css/index.css' rel='stylesheet')
+    link(rel='canonical' href='/')
 
 block nav
     a(href='/stuff') Stuff

web/templates/mindflow.pug

@@ -6,6 +6,7 @@ block meta_description
 block append head
     link(href='/assets/css/mindflow.css' rel='stylesheet')
     script(src='/assets/js/mindflow.js' defer='')
+    link(rel='canonical' href='/mindflow')
 
 block nav
     a(href='/') Home

web/templates/stuff.pug

@@ -3,6 +3,9 @@ extends base.pug
 block meta_description
     meta(name='description' content="Here I share my programs, scripts, articles, may be other stuff.")
 
+block head
+    link(rel='canonical' href='/stuff')
+
 block nav
     a(href='/') Home
     a(href='/mindflow') Mindflow