Replace broken links.

docs/contributing/overview.md

@@ -54,5 +54,4 @@ For a more personal perspective, check these stories where some Decred contribut
 - _I Dump Coins on You_ by s_ben ([Medium](https://medium.com/@seth.benton/i-dump-coins-on-you-ee6db4331e18))
 - _Working for the Decred DAO + Development_ - an episode of Decred in Depth
   podcast with jholdstock
-  ([YouTube](https://www.youtube.com/watch?v=A-zcLGSYxbA),
-  [Libsyn](https://decredindepth.libsyn.com/ep-6-working-for-the-dcr-dao-development-with-jamie-holdstock))
+  ([YouTube](https://www.youtube.com/watch?v=A-zcLGSYxbA))

docs/getting-started/articles-and-media.md

@@ -35,9 +35,9 @@ various aspects of Decred.
 
 - [Introduction to Decred and its privacy implementation](https://unchainedpodcast.com/after-years-of-secret-work-decred-adds-a-new-feature-privacy/) on Laura Shin's Unchained podcast
 
-- [Overview of Decred](https://soundcloud.com/decredindepth/ep-1-jonathan-zeppettini-jz-dcr-101) with Jonathan Zeppettini on the Decred in Depth podcast
+- [Overview of Decred](https://www.youtube.com/watch?v=rcEJuN7zh2M) with Jonathan Zeppettini on the Decred in Depth podcast
 
-- [Cryptoeconomics and Decred as a store of value](https://soundcloud.com/decredindepth/murad-mahmudov-dcr-investment-thesis-sov-narrative-crypto-economics) with economist Murad Mahmudov on the Decred in Depth podcast
+- [Cryptoeconomics and Decred as a store of value](https://www.youtube.com/watch?v=XkvcdjSH0c0) with economist Murad Mahmudov on the Decred in Depth podcast
 
 - [Decred's hybrid approach to blockchain governance](https://soundcloud.com/epicenterbitcoin/eb-193) with Dave Collins and Jake Yocom-Piatt on the Epicenter podcast