docs(frontend): fix a broken link

docs/README.md

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 Learn the basics of Concrete, set it up, and make it run with ease.
 
-<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th><th data-hidden data-card-cover data-type="files"></th></tr></thead><tbody><tr><td><strong>What is Concrete</strong></td><td>Understand the basic concepts of the Concrete library.</td><td><a href="get-started/">get-started</a></td><td><a href=".gitbook/assets/start1.png">start1.png</a></td></tr><tr><td><strong>Installation</strong></td><td>Follow the step by step guide to install Concrete in your project</td><td><a href="get-started/installing.md">installing.md</a></td><td><a href=".gitbook/assets/start2.png">start2.png</a></td></tr><tr><td><strong>Quick start</strong></td><td>See a full example of using Concrete to compute on encrypted data</td><td><a href="get-started/quick_start.md">quick_start.md</a></td><td><a href=".gitbook/assets/start3.png">start3.png</a></td></tr></tbody></table>
+<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th><th data-hidden data-card-cover data-type="files"></th></tr></thead><tbody><tr><td><strong>What is Concrete</strong></td><td>Understand the basic concepts of the Concrete library.</td><td><a href="get-started/readme.md">get-started.md</a></td><td><a href=".gitbook/assets/start1.png">start1.png</a></td></tr><tr><td><strong>Installation</strong></td><td>Follow the step by step guide to install Concrete in your project</td><td><a href="get-started/installing.md">installing.md</a></td><td><a href=".gitbook/assets/start2.png">start2.png</a></td></tr><tr><td><strong>Quick start</strong></td><td>See a full example of using Concrete to compute on encrypted data</td><td><a href="get-started/quick_start.md">quick_start.md</a></td><td><a href=".gitbook/assets/start3.png">start3.png</a></td></tr></tbody></table>
 
 ## Build with Concrete