Docs: remove references to HACKING.md (moved to wiki)

README.md

@@ -6,7 +6,7 @@
 [![Coverity Scan Build Status](https://scan.coverity.com/projects/5389/badge.svg)](https://scan.coverity.com/projects/5389)
 [![GitHub license](https://img.shields.io/github/license/calamares/calamares.svg)](https://github.com/calamares/calamares/blob/master/LICENSE)
 
-| [Report a Bug](https://github.com/calamares/calamares/issues/new) | [Contribute](https://github.com/calamares/calamares/blob/master/ci/HACKING.md) | [Translate](https://www.transifex.com/projects/p/calamares/) | Freenode (IRC): #calamares | [Wiki](https://github.com/calamares/calamares/wiki) |
+| [Report a Bug](https://github.com/calamares/calamares/issues/new) | [Translate](https://www.transifex.com/projects/p/calamares/) | [Contribute](https://github.com/calamares/calamares/wiki/Develop-Guide) | Freenode (IRC): #calamares | [Wiki](https://github.com/calamares/calamares/wiki) |
 |:-----------------------------------------:|:----------------------:|:-----------------------:|:--------------------------:|:--------------------------:|
 
 ### Dependencies

ci/RELEASE.md

@@ -37,7 +37,7 @@ The Calamares release process
 
 * Bump version in `CMakeLists.txt`, *CALAMARES_VERSION* variables, and set
   RC to a non-zero value (e.g. doing -rc1, -rc2, ...). Push that.
-* Check `README.md` and everything `ci/HACKING.md`, make sure it's all still
+* Check `README.md` and the [Coding Guide](https://github.com/calamares/calamares/wiki/Develop-Code), make sure it's all still
   relevant. Run `ci/calamaresstyle` to check the C++ code style.
   Run pycodestyle on recently-modified Python modules, fix what makes sense.
 * Check defaults in `settings.conf` and other configuration files.