add more examples, update README

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diff --git a/_posts/2021-04-10-collapsible.md b/_posts/2021-04-10-collapsible.md
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+---
+title: Collapsible snippets
+excerpt: >
+  Snippets can be hidden in collapsible panels.
+snippets_root_directory: snippets
+snippets_language: c++
+snippets_collapsible: true
+snippets:
+  hello:
+    - hello.hpp
+    - hello.cpp
+  world:
+    - world.hpp
+    - world.cpp
+---
+Just set a front matter value, and voilà!
+
+{% include snippets/section.html section_id='hello' %}
+
+This is another set of snippets:
+
+{% include snippets/section.html section_id='world' %}