add collectivesecuirty and webdevpython

slides/collectivesecurity/collectivesecuirty.md

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+# Collective secuirty
+
+![mandatoryconviniece.png](mandatoryconviniece.png)
+
+# Intro
+
+- Digitalization
+- Privacy and security concerns
+- Individual solutions
+
+# Social media
+
+- Network effect
+- Centralization
+- Single point of failure
+- Profit oriented
+
+# Decentralization
+
+- Chat (Matrix, XMPP)
+- Social media (Fediverse)
+- Email
+
+# Conclusion
+
+- Simple and important
+- Marketing
+- Education
+- Development
+- Undigitalization