Disable windows in CI and deprecate

Author: puremourning

.github/workflows/ci.yml

@@ -12,13 +12,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        runs-on: [ ubuntu-24.04, macos-14, windows-2019 ]
+        runs-on: [ ubuntu-24.04, macos-14 ]
         python-arch: [ 'x64' ]
         include:
           - runs-on: macos-14
             python-arch: 'arm64'
-          - runs-on: windows-2019
-            python-arch: 'x86'
         exclude:
           - runs-on: macos-14
             python-arch: "x64"

README.md

@@ -525,6 +525,10 @@ that are conservatively turned off by default that you may want to turn on.
 
 ### Windows
 
+***NOTE***: Windows support is *deprecated* and *unmaintained*. We will do our
+best to keep it working, but we no longer test it in CI and there is a high
+likelihood of breakages.
+
 #### Quick start, installing all completers
 
 - Install YCM plugin via [Vundle][]