Move repo permissions note to contributing docs

And remove the skip CI note, as it is already noted in CONTRIBUTING.md.

README.md

@@ -418,12 +418,3 @@ We publish an archive with FullCLR bits on every CI build with [AppVeyor][].
 
 [appveyor]: https://ci.appveyor.com/project/PowerShell/powershell-linux
 
-#Troubleshooting
-### Difficulty with push
-If you have difficulty in pushing your changes, there is a high probability that you actually don't have permissions. 
-Be sure that you have write access to corresponding repo (remember that submodules have their own privilege).
-
-#Generally Useful Info
-### Skipping build in ci
-If you want to skip the CI process (for example, updating docs only), just add `[skip ci]` to your commit change comments
-