Introduce general concepts

content/2.general-concepts/0.index.md

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+# General concepts of defense systems
+
+In the following pages are presented different general concepts that are useful to better comprehend the world of defense systems.
+
+You'll find information on :
+
+[1. Abortive infection](/general-concepts/abortive-infection)
+[2. Defense Islands  ](/general-concepts/defense-islands)
+[3. Triggers of defense systems](/general-concepts/defense-systems_trigger)
+[4. Effectors of defense systems](/general-concepts/defense-systems_effector)
+[5. How defense systems were and are discovered](/general-concepts/defense-systems-discovery)
+[6. Defensive domains](/general-concepts/defense-domains)
+[7. MGE and defense systems](/general-concepts/MGE-defense-systems)
+[8. Anti defense systems](/general-concepts/anti-defense-systems)
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