Some more minor fixes for KB initial commit

kb/test_embeds.md

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+This is a file to test embedded diagrams. 
+
+
+``` plantuml
+@startuml
+digraph foo {
+  node [style=rounded]
+  node1 [shape=box]
+  node2 [fillcolor=yellow, style="rounded,filled", shape=diamond]
+  node3 [shape=record, label="{ a | b | c }"]
+
+  node1 -> node2 -> node3
+};
+@enduml
+```

kb/using_kb.md

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+# Working with the KB
+
+This KB is mostly `Markdown`, but it has embedded charts.
+These usually don't work out-of-the-box and might require a little additional configuration.
+
+To check the correect rendering of embedded charts open [this file](test_embeds.md).
+If your editor supports this, and everything is configured correctly,
+you should see a rendered charts.
+
+Here are two options you can use to work with this KB
+
+## PyCharm
+
+- Install `graphviz`.
+- Install and enable the Markdown plugin in PyCharm.
+
+In theory this should be enough, but you may find that charts give you a rendering error
+about not finding "dot".
+In this case find the `dot` executable in your system and copy it to `/opt/local/bin/dot`.
+It should work now.
+
+## Obsidian
+
+- Install the `Obsidian` app
+- Install the PlantUML plugin in Obsidian.
+  You might need to configure the path to the dot executable.