cpp: add categories

Signed-off-by: Matej Focko <me@mfocko.xyz>

cpp/01-values-and-functions/_category_.yaml

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+label: Values and functions
+link:
+  type: generated-index
+  description: |
+    Materials related to the values and functions in C++.

cpp/02-compound-data-types/_category_.yaml

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+label: Compound data types
+link:
+  type: generated-index
+  description: |
+    Materials related to the compound data types in C++.

cpp/03-methods-and-operators/_category_.yaml

@@ -0,0 +1,5 @@
+label: Methods and operators
+link:
+  type: generated-index
+  description: |
+    Materials related to the methods and operators in C++.

cpp/04-lifetime/_category_.yaml

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+label: Lifetime
+link:
+  type: generated-index
+  description: |
+    Materials related to the lifetime in C++.

cpp/05-pointers/_category_.yaml

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+label: Pointers
+link:
+  type: generated-index
+  description: |
+    Materials related to the smart pointers in C++.

cpp/06-inheritance-late-binding/_category_.yaml

@@ -0,0 +1,5 @@
+label: Inheritance and late binding
+link:
+  type: generated-index
+  description: |
+    Materials related to the inheritance and late binding in C++.

cpp/09-sum-types/_category_.yaml

@@ -0,0 +1,5 @@
+label: Sum types
+link:
+  type: generated-index
+  description: |
+    Materials related to the sum types in C++.

cpp/10-algorithms/_category_.yaml

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+label: Algorithms
+link:
+  type: generated-index
+  description: |
+    Materials related to the algorithm header in C++.

cpp/11-iterators/_category_.yaml

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+label: Iterators
+link:
+  type: generated-index
+  description: |
+    Materials related to the iterators in C++.

cpp/12-input-output/_category_.yaml

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+label: Input and output
+link:
+  type: generated-index
+  description: |
+    Materials related to the IO in C++.