DOC 1244 fix seo warnings and errors (#588)

docs/get-started.md

@@ -27,7 +27,7 @@ import TabItem from '@theme/TabItem';
 Aiven provides managed open source services for streaming, storing and analyzing data on all major clouds.
 All services run reliably and securely in the clouds of your choice, are observable, and can easily be integrated with each other and with external 3rd party tools.
 
-<img src={Overview} className="centered" alt="" width="54%" />
+<img src={Overview} className="centered" alt="Illustration of the platform" width="54%" />
 
 ## Discover the Aiven platform
 

docs/platform/howto/use-aws-privatelinks.md

@@ -164,7 +164,7 @@ AWS PrivateLink is not supported in:
     As a result, PrivateLink connection details are added to the **Connection information** section on the service
     <ConsoleLabel name="overview"/>.
 
-    <img src={AivenConsolePrivateLinkConfiguration} className="image"/>
+    <img src={AivenConsolePrivateLinkConfiguration} className="image" alt="Screenshot of the configuration"/>
 
     It takes a couple of minutes before connectivity is available after
     you enable a service component. This is because AWS requires an AWS

docs/platform/howto/vpc-peering-upcloud.md

@@ -95,7 +95,7 @@ The peering becomes active and the traffic is shared only after you create the p
 both from the source network and from the target network.
 :::
 
-<img src={UpcloudVpcPeering} className="image"/>
+<img src={UpcloudVpcPeering} className="image" alt="Create network peering"/>
 
 ### Use the UpCloud API{#upcloud-api}
 

docs/products/kafka/concepts/upgrade-procedure.md

@@ -25,7 +25,7 @@ This example demonstrates the steps in the automated upgrade procedure for
 a 3-node Apache Kafka service, visualized below:
 <!-- vale on -->
 
-<img src={MyImg} className="centered" alt="" width="65%" />
+<img src={MyImg} className="centered" alt="3-node Kafka service" width="60%" />
 
 During an upgrade procedure:
 
@@ -40,7 +40,7 @@ During an upgrade procedure:
 1. **Transfer data and leadership:** The partition data and leadership are transferred
    to new nodes.
 
-    <img src={MyImg2} className="centered" alt="" width="65%" />
+    <img src={MyImg2} className="centered" alt="Kafka cluster illustration" width="65%" />
 
     :::warning
     This step is CPU intensive due to the additional data movement
@@ -58,7 +58,7 @@ During an upgrade procedure:
 1. **Complete process**: The process is completed once the last old node has been
   removed from the cluster.
 
-    <img src={MyImg3} className="centered" alt="" width="65%" />
+    <img src={MyImg3} className="centered" alt="Kafka cluster new node illustration" width="65%" />
 
 ## No downtime during upgrade
 

docs/products/kafka/howto/kafka-quix.md

@@ -40,17 +40,17 @@ To configure and connect Aiven for Apache Kafka® with Klaw:
 1. Create an environment.
    - If you're editing an existing project, open the project settings and click **+ New environment**.
 
-     <img src={NewEnv} className="image" width="50%"/>
+     <img src={NewEnv} className="image" width="50%" alt="New environment"/>
 
    - Follow the setup wizard until you get to the broker settings.
 
 1. When you get to the broker settings, select **Aiven** as your broken provider.
 
-   <img src={BrokerOption} className="image" width="50%"/>
+   <img src={BrokerOption} className="image" width="50%" alt="Broker settings"/>
 
 1. Configure the required settings:
 
-   <img src={BrokerSettings} className="image" width="50%"/>
+   <img src={BrokerSettings} className="image" width="50%" alt="Broker setup"/>
 
    - **Service URI**: Enter the Service URI for your Apache Kafka service. Find the
      service URI in the Connection information page of your service in Aiven Console
@@ -72,7 +72,7 @@ can deploy in a few clicks.
 To test your Aiven for Apache Kafka® connection, you can use the [_Hello Quix_
 template](https://quix.io/templates/hello-quix), which is a three-step pipeline:
 
-<img src={Template} className="image"/>
+<img src={Template} className="image" alt="Screenshot of a pipeline"/>
 
 1. Click [**Clone this project**](https://portal.platform.quix.io/signup?projectName=Hello%20Quix&httpsUrl=https://github.com/quixio/template-hello-quix&branchName=tutorial).
 1. On the **Import Project** screen, click **Quix advanced configuration**  to ensure
@@ -85,7 +85,7 @@ template](https://quix.io/templates/hello-quix), which is a three-step pipeline:
 
 In the Quix portal, wait for the services to deploy and their status to become **Running**.
 
-<img src={Pipeline} className="image"/>
+<img src={Pipeline} className="image" alt="Screenshot of a pipeline"/>
 
 Ensure the `_csv-data_` and `_counted-names_` required topics appear in both Quix
 and Aiven. In Aiven, topics that originate from Quix have the Quix workspace