Centralize dist ignore rule

atimmer · atimmer · commit 992425a95236 · 2019-03-11T12:18:35.000+01:00
We are going to publish from `/dist`, so it should be ignored in every
package.
diff --git a/.gitignore b/.gitignore
@@ -1 +1,2 @@
 node_modules
+/packages/*/dist
diff --git a/packages/yoastseo/.gitignore b/packages/yoastseo/.gitignore
@@ -4,7 +4,6 @@ temp-spec/
 node_modules/
 out/
 coverage/
-dist/
 .tscache/
 
 /examples/browserified/example-browserified.js
