updated changelog for v0.1.9 release

Signed-off-by: nirparikh05 <nir.parikh05@gmail.com>

docs/bootstrap-ca.md

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+## Understanding Bootstrapping and Sentry CA flow
+
+``` mermaid
+sequenceDiagram
+    participant sentry
+    participant bootstrapinfra
+    participant bootstrapagent
+    participant agent
+    sentry->>sentry: create selfsign ca cert / private-key
+    sentry->>bootstrapinfra: create bootstrap-infra entries
+    sentry->>bootstrapagent: create bootstrap-agent entries
+    agent->>agent: create csr ( with private key )
+    agent->>sentry: register request ( infra-ref, agent-token )
+    sentry->>bootstrapagent: check agent-token
+    sentry->>bootstrapinfra: get ca cert/private-key to sign csr
+    sentry->>sentry: sign agent csr
+    sentry->>agent: respond signed cert
+```

docs/user-journey.md

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+``` mermaid
+sequenceDiagram
+    User->>+Paralus: helm install paralus/ztka
+    Paralus->>+Paralus: create admin user with auto-gen credentials 
+    User->>+AdminUser: share credentials
+    AdminUser->>+Dashboard: Login using admin creds for first time
+    Alice->>+InstallParalus: John, can you hear me?
+    Paralus-->>-Alice: Hi Alice, I can hear you!
+    Paralus-->>-Alice: I feel great!
+```
+
+```mermaid
+graph TD
+    A[Admin] -->|Install Paralus with auto-gen credentials| B(Admin Login)
+    B --> C{First time login ?}
+    C -->|Yes| D[Force Password Reset]
+    C -->|No| E[Continue to dashboard]
+```
+
+```mermaid
+graph TD
+    A[Admin] -->|Add user / reset password with auto-gen credentials! Admin shares credentials with user| B(User Login)
+    B --> C{First time login / force reset enabled ?}
+    C -->|Yes| D[Force Password Reset]
+    C -->|No| E[Continue to dashboard]
+```