docs: update demo instruction for revocable vc

docs/demo.md

@@ -9,16 +9,19 @@ mkdir ssi-demo
 cd ssi-demo
 ```
 
-2. Clone VON network, Aries Cloud Agent Python and this repository into the repository you just created
+2. Clone VON network, Aries Cloud Agent Python, Indy Tails Server and this repository into the 
+   repository you 
+   just created
 
 ```bash
 # Inside /ssi-demo
 git clone https://github.com/bcgov/von-network.git
-git clone https://gitlab.cs.ut.ee/ssi-xroad/aries-cloudagent-python acapy
-git clone https://gitlab.cs.ut.ee/ssi-xroad/ssi-xroad
+git clone https://gitlab.cs.ut.ee/ssi-xroad/aries-cloudagent-python.git acapy
+git clone https://gitlab.cs.ut.ee/ssi-xroad/indy-tails-server.git
+git clone https://gitlab.cs.ut.ee/ssi-xroad/ssi-xroad.git
 ```
 
-3. Build and start VON network
+3. Build and start VON network, a portable development level Indy Node network.
 
 ```bash
 # Inside /ssi-demo
@@ -27,12 +30,30 @@ cd von-network
 ./manage start
 ```
 
-4. Build and run the demo with Docker Compose
+4. Start Indy Tails Server to store and serve Hyperledger Indy Tails files for issuing revocable 
+   AnonCreds.
+
+```bash
+# Inside /ssi-demo
+cd indy-tails-server/docker
+./manage start
+./manage logs
+```
+
+5. From the logs you should find a line similar to the example below. Copy the HTTPs address for 
+   next step. Press `ctrl-c` to exit from logs.
+
+```bash
+docker-ngrok-tails-server-1  | t=2023-05-01T12:37:41+0000 lvl=info msg="started tunnel" 
+obj=tunnels name=command_line addr=http://tails-server:6543 url=https://778e-84-50-171-147.ngrok.io
+```
+
+6. Build and run the demo with Docker Compose
 
 ```bash
 # Inside /ssi-demo
 cd ssi-xroad
-./run_demo.sh
+TAILS_SERVER_URL=REPLACE_WITH_COPIED_TAILS_SERVER_URL ./run_demo.sh
 ```
 
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