Design and Public API documentation completed.

The draw.io diagrams are in Gerrit. If the page is ever deleted, they
will be lost. They ae now saved in XML format in gerrit.

The design documentation links to the examples in github rather than
quoting them in the document. General tidy up and cleaning of links,
rewording, and reformatting of desgin document.

Added missing diagram to the Design document.

Updated and tidied up the internal PAP/PDP document.

General improvement of documentation.

Issue-ID: POLICY-1676
Change-Id: Ie5c9f32693f047beafe14a3e412a32cdf9ed6fde
Signed-off-by: liamfallon <liam.fallon@est.tech>
diff --git a/docs/architecture/images/PolicyExecution.svg b/docs/architecture/images/PolicyExecution.svg
index c9b2f7f..23a0077 100644
--- a/docs/architecture/images/PolicyExecution.svg
+++ b/docs/architecture/images/PolicyExecution.svg
@@ -1,34 +1,2 @@
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-@startuml

-title Policy Execution

-

-participant REQUESTOR

-participant RESPONDEE

-participant PDP

-

-autonumber

-

-alt Synchronous Invocation

-  REQUESTOR - -> PDP: Execute Policy

-  activate PDP

-  hnote over REQUESTOR : wait

-  PDP - -> REQUESTOR: Policy Execution Result

-  deactivate PDP

-else Asynchronous Invocation

-  REQUESTOR - -> PDP: Execute Policy

-  activate PDP

-  PDP - -> RESPONDEE: Policy Execution Result

-  deactivate PDP

-end

-@enduml

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-JVM: Java HotSpot(TM) 64-Bit Server VM
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-Operating System: Linux
-Default Encoding: UTF-8
-Language: en
-Country: US
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