module: add page (#4628)

pages/linux/module.md

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+# module
+
+> Modify a users' environment using the module command.
+> More information: <https://lmod.readthedocs.io/en/latest/010_user.html>.
+
+- Display available modules:
+
+`module avail`
+
+- Search for a module by name:
+
+`module spider {{module_name}}`
+
+- Load a module:
+
+`module load {{module_name}}`
+
+- Display loaded modules:
+
+`module list`
+
+- Unload a specific loaded module:
+
+`module {{module_name}}`
+
+- Unload all loaded modules:
+
+`module purge`