Updated challenges showing off dojo features

hello/banana/README.md

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+# hello
+## banana
+
+This challenge is named `banana`, and is located within module `hello`.
+
+When users start this challenge, their environment will have:
+- `/flag`
+- `/challenge/banana`
+- `/chalenge/.config`
+
+Within a challenge's definition, directories which begin with `_` are statically instanced.
+Users will randomly, but deterministically, be assigned one instance of the challenge.
+Every time they start the challenge, they will be assigned the same static instance.
+This allows different users to receive different versions of the same challenge.

hello/banana/_0/.config

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+0

hello/banana/_1/.config

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+1

hello/banana/_2/.config

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+2

hello/banana/banana

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+#!/opt/pwn.college/python
+
+import pathlib
+
+config = (pathlib.Path(__file__).parent / ".config").read_text().strip()
+
+print(f"Instance: {config}")
+
+with open("/flag") as f:
+    print(f.read())