[docs-infra] Fix GitHub source link redirection (#43534)

Author: oliviertassinari

packages/mui-docs/src/ComponentLinkHeader/ComponentLinkHeader.tsx

@@ -107,14 +107,13 @@ export function ComponentLinkHeader(props: ComponentLinkHeaderProps) {
             size="small"
             variant="outlined"
             rel="nofollow"
-            href={`${process.env.SOURCE_CODE_REPO}/blob/v${process.env.LIB_VERSION}/${headers.githubSource}`}
+            href={`${process.env.SOURCE_CODE_REPO}/tree/v${process.env.LIB_VERSION}/${headers.githubSource}`}
             icon={<GitHubIcon />}
             data-ga-event-category="ComponentLinkHeader"
             data-ga-event-action="click"
             data-ga-event-label="Source"
             data-ga-event-split="0.1"
             label="Source"
-            target="_blank"
           />
         </li>
       ) : null}