Fix vuepress dependency issue

Running vuepress locally was failing due to a missing module. This
issue was created by a recent upgrade made using npm audit fix to
resolve some npm module security issues. The issue was resolved by
deleting the package-lock.json and rebuilding on an npm install. I
updated vuepress since there was a minor version change.

TESTING
I was able to run the docs locally and docs are rendering as expected.

Signed-off-by: Derick Montague <derick.montague@ibm.com>
Change-Id: If59c52a7a13b03e910c7c2b9969bef43d5808de8
diff --git a/package.json b/package.json
index ae92065..43c0e25 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,7 @@
     "sass-loader": "8.0.0",
     "vue-cli-plugin-i18n": "0.6.1",
     "vue-template-compiler": "2.6.11",
-    "vuepress": "1.4.0"
+    "vuepress": "1.5.0"
   },
   "engines": {
     "node": ">=12.14.1"