doc: move-only release notes for 0.20.1 #19482

1. 
   MarcoFalke commented at 11:58 AM on July 10, 2020: member

   Also fix appveyor

2. doc: Clear release notes for minor release fa39988598
3. doc: move-only release notes for 0.20.1 888886ed5b
4. appveyor: Remove clcache

   Github-Pull: #18640
   Rebased-From: fac0c8db9f634ea7231fb0b6dc139ae0bda4a051

   faf5e256c5
5. Remove cached directories and associated script blocks from appveyor CI configuration.

   Github-Pull: #19444
   Rebased-From: 961e667600441c35845fcb36b120500c813cd3ed

   fae0e93836
6. MarcoFalke added the label Docs on Jul 10, 2020
7. fanquake added this to the milestone 0.20.1 on Jul 10, 2020
8. fanquake approved
9. 
   fanquake commented at 3:32 AM on July 15, 2020: member

   ACK fae0e93836c0aa96b9274c69651b02cbf6352dc1

10. fanquake merged this on Jul 15, 2020
11. fanquake closed this on Jul 15, 2020

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12. MarcoFalke deleted the branch on Jul 15, 2020
13. DrahtBot locked this on Feb 15, 2022

Milestone
0.20.1