Move clients logos to local assets instead of fetching them remotely

  It's faster and solve the blinking problem on the clients
  presentation.

docs/content/clients/_index.md

@@ -10,10 +10,10 @@ pre = "<b>3. </b>"
 There exists a variety of clients for Ogmios. Initially, the TypeScript client was developed alongside the server as a proof-of-concept. Over time, amazing community members have developed new clients in their favorite languages:
 
 <table align="center"><thead><tr>
-<td align="center"><img height=72 width=72 src="https://github.com/cardanosolutions/ogmios/blob/master/.github/clients/typescript.png?raw=true" alt="Logo:TypeScript"><br/><a href="https://ogmios.dev/typescript/api/modules/_cardano_ogmios_client.html"><strong>TypeScript</strong></a></td>
-<td align="center"><img height=72 width=72 src="https://github.com/cardanosolutions/ogmios/blob/master/.github/clients/go.png?raw=true" alt="Logo:Go"><br/><a href="https://github.com/SundaeSwap-finance/ogmigo#readme"><strong>Go</strong></a></td>
-<td align="center"><img height=72 width=72 src="https://github.com/cardanosolutions/ogmios/blob/master/.github/clients/kotlin.png?raw=true" alt="Logo:Kotlin"><br/><a href="https://github.com/projectNEWM/kogmios#readme"><strong>Kotlin</strong></a></td>
-<td align="center"><img height=72 width=72 src="https://github.com/cardanosolutions/ogmios/blob/master/.github/clients/java.png?raw=true" alt="Logo:Java"><br/><a href="https://github.com/adabox-aio/ogmios-java-client.git#readme"><strong>Java</strong></a></td>
+<td align="center"><img height=72 width=72 src="/images/clients/typescript.png" alt="Logo:TypeScript"><br/><a href="https://ogmios.dev/typescript/api/modules/_cardano_ogmios_client.html"><strong>TypeScript</strong></a></td>
+<td align="center"><img height=72 width=72 src="/images/clients/go.png" alt="Logo:Go"><br/><a href="https://github.com/SundaeSwap-finance/ogmigo#readme"><strong>Go</strong></a></td>
+<td align="center"><img height=72 width=72 src="/images/clients/kotlin.png" alt="Logo:Kotlin"><br/><a href="https://github.com/projectNEWM/kogmios#readme"><strong>Kotlin</strong></a></td>
+<td align="center"><img height=72 width=72 src="/images/clients/java.png" alt="Logo:Java"><br/><a href="https://github.com/adabox-aio/ogmios-java-client.git#readme"><strong>Java</strong></a></td>
 </tr><thead></table>
 
 In this manual, we cover some usage of the TypeScript client. For other clients, please refer to their respective projects and maintainers.