add Mariatta video on Sponsor page (#203)

* add Mariatta video * fix grammar * grammar * mv MW video to main event page from sponsors

Author: reshamas

2023-03_sprint/index.md

@@ -9,6 +9,18 @@ This event is focused on the Latin America region. If you are available on the e
 <meta name="twitter:description" content="Beginner friendly working sessions to get started contributing to PyMC">
 <meta name="twitter:image" content="https://raw.githubusercontent.com/pymc-devs/pymc-data-umbrella/main/_static/banner_2023_03/2023_03_banner_1280_640px.png">
 
+## Inspirational Tips on Contributing to Open Source
+Check out this 3-minute video by [Mariatta Wijaya](https://www.linkedin.com/in/mariatta/). She has been a Python core developer since 2017, and she shares a few inspirational remarks for those beginning or continuing their journey in contributing to open source.
+
+- "I wish someone had told me earlier how amazing open source is and I had become involved earlier."
+- Participating in and influencing decisions in the open source community is important.
+- Open source lets us learn about: continuous integration, unit tests, documentation, packaging
+
+## Video
+
+:::{youtube} NpWdYEp8-u4
+:::
+
 ## Schedule
 
 :::{important}

2023-03_sprint/sprint_parties/sponsors.md

@@ -1,4 +1,5 @@
 # Data Umbrella Sponsors
+
 ::::{grid} 1 1 2 2
 :::{grid-item-card}
 :link: https://opensource.google/
@@ -19,4 +20,3 @@ We bring all the value of open source to Google and all the resources of Google
 We help solve some of society’s toughest challenges — from eradicating disease and improving education, to addressing the needs of our local communities. Our mission is to build a more inclusive, just, and healthy future for everyone.
 :::
 ::::
-