(DOCSP-17534): add redirect for PLP changes

Author: jwilliams-mongo

config/redirects

@@ -41,3 +41,7 @@ raw: bi-connector/release-notes -> ${base}/master/release-notes/
 (v2.4-*]: bi-connector/${version}/tutorial/install-auth-plugin-c/ -> ${base}/${version}/reference/auth-plugin-c/
 (v2.4-*]: bi-connector/${version}/tutorial/install-auth-plugin-jdbc/ -> ${base}/${version}/reference/auth-plugin-jdbc/
 (v2.4-*]: bi-connector/${version}/client-dependencies/ -> ${base}/${version}/authentication/
+
+# redirect from what is BIC page to index in older versions (PLP is new index)
+
+[*-v2.12]: bi-connector/${version}/what-is-the-bi-connector -> ${base}/${version}/