Docker and azure updates (#95)

* Add Docker page to Getting Started section

* Update Azure configuration documentation for the latest version of Tessera which replaces deprecated Azure client library

* Fix vale lint error

* Update link to jasypt docs as www.jasypt.org is unavailable

* Update link to jasypt docs as www.jasypt.org is unavailable

docs/HowTo/Configure/Database.md

@@ -19,7 +19,7 @@ Any valid JDBC URL may be specified, refer to your providers details to construc
 
 Certain entries in the Tessera configuration file must be obfuscated to prevent any attempts from
 attackers to gain access to critical parts of the application (for example the database).
-The database password can be encrypted using [Jasypt](http://www.jasypt.org) to avoid it being
+The database password can be encrypted using [Jasypt](https://github.com/jasypt/jasypt) to avoid it being
 exposed as plain text in the configuration file.
 
 To enable this feature, simply replace your plain-text database password with its encrypted value
@@ -47,7 +47,7 @@ password however this approach is not recommended for production environments.
 
 ### How to encrypt database password
 
-1. Download and unzip [Jasypt](http://www.jasypt.org) and redirect to the `bin` directory
+1. Download and unzip [Jasypt](https://github.com/jasypt/jasypt) and redirect to the `bin` directory
 1. Encrypt the password
 
     === "Command"

docs/HowTo/Configure/KeyVault/Azure-Key-Vault.md

@@ -75,12 +75,13 @@ To authorise the newly registered app to use the Key Vault complete the followin
 
 ### Environment Variables
 
-If using an Azure Key Vault, Tessera requires two environment variables to be set:
+If using an Azure Key Vault, Tessera requires three environment variables to be set:
 
 1. `AZURE_CLIENT_ID`: The `Application ID`
 1. `AZURE_CLIENT_SECRET`: The application registration `key`
+1. `AZURE_TENANT_ID`: The Azure Active Directory `Tenant ID`
 
-Both of these values can be retrieved during the application registration process as outlined above.
+Each of these values can be retrieved during the application registration process as outlined above.
 
 ### Dependencies
 

docs/HowTo/Get-started/Docker-Images.md

@@ -0,0 +1,23 @@
+---
+description: Use Tessera Docker images
+---
+
+# Docker images
+
+Docker images are available at [quorumengineering/tessera](https://hub.docker.com/r/quorumengineering/tessera).
+
+Various images are available (Tessera, Tessera with additional key vault support, etc.).  See Tessera's [Docker README](https://github.com/ConsenSys/tessera/blob/master/docker/README.md) for more information.
+
+## Usage
+
+Pull an image:
+
+```shell
+docker pull quorumengineering/tessera:latest # pull latest release version
+```
+
+Verify image:
+
+```shell
+docker run quorumengineering/tessera:latest help
+```

mkdocs.yml

@@ -57,6 +57,7 @@ nav:
     - Get started with Tessera:
       - Dependencies: HowTo/Get-started/Dependencies.md
       - Install distribution: HowTo/Get-started/Distribution.md
+      - Docker images: HowTo/Get-started/Docker-Images.md
       - Build from source: HowTo/Get-started/Build-From-Source.md
       - Start Tessera: HowTo/Get-started/Start-Tessera.md
     - Generate keys: