Removing broken link (#741)

removing link to GSoD as it is not a mentorship program

Signed-off-by: Nate W <natew@cncf.io>

website/content/contributors/_index.md

@@ -29,7 +29,6 @@ The Cloud Native Computing Foundation participates in various mentoring programs
 
 * [LFX Mentorship (ex-CommunityBridge)](https://mentorship.lfx.linuxfoundation.org): mentoring initiative by the Linux Foundation - [details](https://github.com/cncf/mentoring/tree/main/programs/lfx-mentorship#readme)
 * [Google Summer of Code](https://summerofcode.withgoogle.com/): mentoring program for the open source beginners - [details](https://github.com/cncf/mentoring/tree/main/programs/summerofcode#readme)
-* [Google Season of Docs](https://developers.google.com/season-of-docs): mentoring initiative for the technical writers - [details](https://github.com/cncf/mentoring/tree/main/programs/seasonofdocs#readme)
 * [Outreachy](https://www.outreachy.org): mentoring initiative for the communities traditionally underrepresented in tech - [details](https://github.com/cncf/mentoring/tree/main/programs/outreachy#readme)
 
 If you are interested in participating in one of the programs, please check out the [CNCF mentoring repository](https://github.com/cncf/mentoring) for more details.