Add quickstart guide

Reviewed-by: Aleix Boné <abonerib@bsc.es>

web/hugo.toml

@@ -3,32 +3,38 @@ languageCode = 'en-us'
 title = 'The jungle'
 theme = 'PaperMod'
 
+[[menu.main]]
+identifier = "doc"
+name = "Docs"
+url = "/doc/"
+weight = 10
+
 [[menu.main]]
 identifier = "grafana"
 name = "Grafana"
 url = "/grafana/"
-weight = 10
+weight = 20
 
 [[menu.main]]
 identifier = "Git"
 name = "Git"
 url = "/git/"
-weight = 20
+weight = 30
 
 [[menu.main]]
 identifier = "Lists"
 name = "Lists"
 url = "/lists/"
-weight = 30
+weight = 40
 
 [[menu.main]]
 identifier = "Paste"
 name = "Paste"
 url = "/paste/"
-weight = 40
+weight = 50
 
 [[menu.main]]
 identifier = "Posts"
 name = "Posts"
 url = "/posts/"
-weight = 50
+weight = 60