* Update to dmd-2.088.0 and ldc-1.18.0
* Update documentation based on change in DMD and LDC minimum versions. Minimum DMD version now 2.088.0 and minimum LDC version now 1.18.0.
* Security upgrade alpine Docker file to 3.16
Same core dump issue exists for Ubuntu 21.04 when using Ubuntu packages ... even though a newer LDC version is being used, libllvm11 remains the same which is causing the issue. Building from source, using the LDC package, no core dump occurs - thus, this is 100% a packaging process issue.
Replace embedded image references with unicode characters, otherwise the images are clickable and mislead users into clicking, thinking that they can download the corresponding package
* Add new document to detail package installation on Debian and Ubuntu platforms via OpenSuSE Build Service
* Depreciate recommending Ubuntu PPA due to dependency on Debian packages
