fix category in two blogs (#635)

Author: noatamir

apps/labs/posts/joining_labs.md

@@ -3,7 +3,7 @@ title: 'Thoughts on joining Quansight Labs'
 published: April 8, 2019
 author: ralf-gommers
 description: "Ralf Gommers's thoughts on joining Quansight Labs as its director, and his perspectives for pushing forward the Python ecosystem for scientific computing and data science, and how to fund it."
-category: [Community, PyData Ecosystem]
+category: [Community, PyData ecosystem]
 featuredImage:
   src: /posts/joining_labs/community_landscape.png
   alt: 'Image of a word cloud emphasizing the interrelationship of Projects with Assets, Funding and Community.'

apps/labs/posts/quansight-at-scipy2019.md

@@ -3,7 +3,7 @@ title: "Quansight presence at SciPy'19"
 published: July 15, 2019
 author: ralf-gommers
 description: "This post is just a quick update to summarize Quansight's presence and contributions, as well as some of the more interesting things I noticed."
-category: [Community, PyData Ecosystem]
+category: [Community, PyData ecosystem]
 featuredImage:
   src: /posts/quansight-at-scipy2019/blog_feature_org.svg
   alt: 'An illustration of a brown and a white hand coming towards each other to pass a business card with the logo of Quansight Labs'