Add more docs redirects (#153)

docs/_redirects

@@ -1,5 +1,6 @@
 /docs/getting-started /guides/getting-started 301
 /docs/guides/best-practices /guides/tokens 301
+/docs/guides/creating-plugins /advanced/plugin-api 301
 /docs/guides/design-tokens /guides/tokens 301
 /docs/guides/figma /integrations/figma 301
 /docs/guides/modes /guides/modes 301
@@ -12,6 +13,7 @@
 /docs/integrations/tokens-studio /integrations/figma 301
 /docs/integrations/ts /integrations/js 301
 /docs/plugins/css /integrations/css 301
+/docs/plugins/custom /advanced/plugin-api 301
 /docs/plugins/js /integrations/js 301
 /docs/plugins/json /integrations/json 301
 /docs/plugins/sass /integrations/css 301
@@ -20,4 +22,5 @@
 /docs/reference/about /advanced/about 301
 /docs/reference/cli /guides/cli 301
 /docs/reference/config /advanced/config 301
+/docs/reference/schema /guides/tokens 301
 /docs/tokens /tokens/color 301