Update theme

Signed-off-by: Danila Fedorin <danila.fedorin@gmail.com>

content/blog/02_types_variables.md

@@ -339,9 +339,8 @@ this means the rule applies to (object) variables declared to have type
 our system. A single rule takes care of figuring the types of _all_
 variables.
 
-{{< todo >}}
-The rest of this, but mostly statements.
-{{< /todo >}}
+> [!TODO]
+> The rest of this, but mostly statements.
 
 ### This Page at a Glance
 #### Metavariables

content/blog/idris_catamorphisms.md

@@ -17,7 +17,8 @@ spend time explaining dependent types, nor the syntax for them in Idris,
 which is the language I'll use in this article. Below are a few resources
 that should help you get up to speed.
 
-{{< todo >}}List resources{{< /todo >}}
+> [!TODO]
+> List resources
 
 We've seen that, given a function `F a -> a`, we can define a function
 `B -> a`, if `F` is a base functor of the type `B`. However, what if