docs: layout / structure changes

docs/instructions/usage.md

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+# **Using BBGradebookOrganiser**
+
+## **Download gradebook**
+
+1. Go to the course page on Blackboard
+
+2. Go to *Grade Centre -> Full Grade Centre*
+
+3. Find the assignment and click on the arrow for more options, and select *Assignment File Download*
+
+4. Select all (click *Show All* at the bottom first, to display all users) and click submit to generate the gradebook zip file
+
+5. Wait for the generated download link to appear, and click to download
+
+## **Extract gradebook**
+
+Extract the downloaded gradebook in a new directory inside *BB_gradebooks*.
+
+- e.g. for `AssignmentX` extract the gradebook in *BB_gradebooks*/`AssignmentX`
+
+## **Organise gradebook**
+
+To organise the gradebook run **`organise_gradebook.py`** and provide the name of the directory with the *extracted* gradebook (from section *Extract gradebook* above) as an argument.
+
+- e.g. for gradebook `AssignmentX` (in *BB_gradebooks*/`AssignmentX`) run:
+
+```console
+python organise_gradebook.py AssignmentX
+```
+
+While running, the script displays on the terminal information and stats about the gradebook submissions and files.
+
+## **Post-run**
+
+All submission files can be found - organised in directories per student number - in directory *BB_submissions*, under the sub-directory named after the gradebook name provided when running the script.
+
+- e.g. `organise_gradebook.py AssignmentX` creates the directory `AssignmentX` inside *BB_submissions*
+
+Each student directory contains:
+
+- the extracted files from the submitted `.zip`, `.rar`, `.7z`
+  
+- the individually submitted files
+  
+- the text file generated by Blackboard for the submission (which also contains any comments left by the student)
+
+All comments found in the gradebook are extracted in a text file in *BB_submissions*, with the gradebook name as prefix.
+
+- e.g. `AssignmentX_comments.txt` will be created for gradebook `AssignmentX`
+
+Compressed files are deleted after successfully extracting and organising the contents.
+
+- Any invalid/corrupt compressed files are moved into folder `__BAD__` inside the gradebook directory
+
+## **Inspect by hash** :mag:
+
+See [***Inspect by hash***](../inspect/about.md) for more information & details.