Restructure documentation - separate Inspect by hash

docs/inspect/about.md

@@ -26,4 +26,4 @@ With **Inspect by hash** you can inspect the submissions for identical files (by
 
 - File names and paths listed in the generated CSV files have hyperlinks to the actual files for a quick inspection of the file contents (or running the files, if executable)
 
-*Note:* Further analysis needs to be done manually by inspecting and filtering the generated output, depending on the submission and its files.
+*Note:* Further analysis needs to be done manually by inspecting and filtering the generated output, depending on the submission and its files.

docs/inspect/requirements.md

@@ -0,0 +1,9 @@
+# **Inspect by hash** :mag:
+
+## **Requirements**
+
+The ***inspect*** scripts require the `pandas` package - if it's not already installed, run:
+
+```console
+python -m pip install pandas
+```

docs/inspect/usage.md

@@ -1,13 +1,5 @@
 # **Using Inspect by hash** :mag:
 
-## **Requirements**
-
-Before running the *inspect* scripts for the first time, you also need to install the *pandas* package:
-
-```console
-python -m pip install pandas
-```
-
 ## **Inspect gradebook**
 
 If you haven't already, extract the downloaded from *Blackboard* gradebook in a new directory inside *BB_gradebooks*