Remove circleci, old freebsd ci and vagrant (pkgeval) config files (J…

…uliaLang#31841)

* Remove circleci, old freebsd ci and vagrant (pkgeval) files

* Remove vagrant from readme.

* Move ack stuff to contrib/ack

contrib/README.md

@@ -19,7 +19,6 @@ Installation
 |[ repackage_system_suitesparse4.make ](https://github.com/JuliaLang/julia/blob/master/contrib/repackage_system_suitesparse4.make) | Links shared    libraries from static-library for suitesparse4 |
 |[ stringreplace.c ](https://github.com/JuliaLang/julia/blob/master/contrib/stringreplace.c) | Replace strings to hardcoded paths in binaries during `make install` |
 |[ travis_fastfail.sh ](https://github.com/JuliaLang/julia/blob/master/contrib/travis_fastfail.sh ) |  Checks for queued build tests in Travis |
-|[ vagrant/ ](https://github.com/JuliaLang/julia/blob/master/contrib/vagrant/) | Portable development environment Vagrant install files |
 |[ windows/ ](https://github.com/JuliaLang/julia/blob/master/contrib/windows/) | Windows install files |
 
 Editors  + Debuggers