docs/security: moves the diagrams and assets into subdirs

Author: ufukty

…urity/assets/equalizer-js-vs-go-zoom.png …rity/.assets/equalizer-js-vs-go-zoom.pngdocs/security/assets/equalizer-js-vs-go-zoom.png renamed to docs/security/.assets/equalizer-js-vs-go-zoom.png docs/security/assets/equalizer-js-vs-go-zoom.png renamed to docs/security/.assets/equalizer-js-vs-go-zoom.png

@@ -1,5 +1,5 @@
 all: \
-	pdp.png
+	.assets/pdp.png
 
-pdp.png: pdp.mmd
-	mmdc -f -e png -s 3 -i "pdp.mmd" -o "pdp.png"
+.assets/pdp.png: .diagrams/pdp.mmd
+	mmdc -f -e png -s 3 -i .diagrams/pdp.mmd -o .assets/pdp.png

…s/security/assets/equalizer-js-vs-go.png …/security/.assets/equalizer-js-vs-go.pngdocs/security/assets/equalizer-js-vs-go.png renamed to docs/security/.assets/equalizer-js-vs-go.png docs/security/assets/equalizer-js-vs-go.png renamed to docs/security/.assets/equalizer-js-vs-go.png

@@ -237,4 +237,4 @@ The design shapes a **centralized** & **stateless** Policy Decision Point (PDP).
 - **Complex access control logic**: Due to collaboration and hierarchical groups
 - **Distributed data**: Involved data in the decision process is too big and varying to gather in one place
 
-![](pdp.png)
+![](.assets/pdp.png)