refactor: move echo and muck examples under new examples/ directory

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diff --git a/examples/echo/echo.md b/examples/echo/echo.md
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+---
+title: "**echo**(1) acceptance tests"
+author: The Subplot project
+template: bash
+bindings: echo.yaml
+functions: echo.sh
+bibliography: echo.bib
+...
+
+Introduction
+=============================================================================
+
+**echo**(1) is a Unix command line tool, which writes its command line
+arguments to the standard output. This is a simple acceptance test
+suite for the `/bin/echo` implementation.
+
+For more information, see [@foo2020].
+
+No arguments
+=============================================================================
+
+Run `/bin/echo` without arguments.
+
+```scenario
+when user runs echo without arguments
+then exit code is 0
+then standard output contains a newline
+then standard error is empty
+```
+
+Hello, world
+=============================================================================
+
+This scenario runs `/bin/echo` to produce the output "hello, world".
+
+```scenario
+when user runs echo with arguments hello, world
+then exit code is 0
+then standard output contains "hello, world"
+then standard error is empty
+```
+
+
+Test file
+
+~~~~{.file #foo.dat}
+This is a test file.
+Two lines.
+~~~~
+
+
+# References