doc: update README to link to the html docs and fix links

Also some minor formatting improvements and linking the home page.

Author: rgommers

README.md

@@ -15,27 +15,32 @@ OSUOSL IBMZ-CI [![Build Status](http://ibmz-ci.osuosl.org/buildStatus/icon?job=O
 
 OpenBLAS is an optimized BLAS (Basic Linear Algebra Subprograms) library based on GotoBLAS2 1.13 BSD version.
 
-Please read the documentation in the OpenBLAS folder: <https://github.com/OpenMathLib/OpenBLAS/docs>.
+For more information about OpenBLAS, please see:
+
+- The documentation at [openmathlib.org/OpenBLAS/docs/](http://www.openmathlib.org/OpenBLAS/docs),
+- The home page at [openmathlib.org/OpenBLAS/](http://www.openmathlib.org/OpenBLAS).
 
 For a general introduction to the BLAS routines, please refer to the extensive documentation of their reference implementation hosted at netlib:
 <https://www.netlib.org/blas>. On that site you will likewise find documentation for the reference implementation of the higher-level library LAPACK - the **L**inear **A**lgebra **Pack**age that comes included with OpenBLAS. If you are looking for a general primer or refresher on Linear Algebra, the set of six
-20-minute lecture videos by Prof. Gilbert Strang on either MIT OpenCourseWare <https://ocw.mit.edu/resources/res-18-010-a-2020-vision-of-linear-algebra-spring-2020/> or Youtube <https://www.youtube.com/playlist?list=PLUl4u3cNGP61iQEFiWLE21EJCxwmWvvek> may be helpful.
+20-minute lecture videos by Prof. Gilbert Strang on either MIT OpenCourseWare [here](https://ocw.mit.edu/resources/res-18-010-a-2020-vision-of-linear-algebra-spring-2020/) or YouTube [here](https://www.youtube.com/playlist?list=PLUl4u3cNGP61iQEFiWLE21EJCxwmWvvek) may be helpful.
 
 ## Binary Packages
 
 We provide official binary packages for the following platform:
 
   * Windows x86/x86_64
 
-You can download them from [file hosting on sourceforge.net](https://sourceforge.net/projects/openblas/files/) or from the Releases section of the github project page, [https://github.com/OpenMathLib/OpenBLAS/releases](https://github.com/OpenMathLib/OpenBLAS/releases).
+You can download them from [file hosting on sourceforge.net](https://sourceforge.net/projects/openblas/files/) or from the [Releases section of the GitHub project page](https://github.com/OpenMathLib/OpenBLAS/releases).
+
+OpenBLAS is also packaged for many package managers - see [the installation section of the docs](http://www.openmathlib.org/OpenBLAS/docs/install/) for details.
 
 ## Installation from Source
 
-Download from project homepage, https://github.com/OpenMathLib/OpenBLAS/, or check out the code
-using Git from https://github.com/OpenMathLib/OpenBLAS.git. (If you want the most up to date version, be
-sure to use the develop branch - master is several years out of date due to a change of maintainership.)
-Buildtime parameters can be chosen in Makefile.rule, see there for a short description of each option.
-Most can also be given directly on the make or cmake command line.
+Obtain the source code from https://github.com/OpenMathLib/OpenBLAS/. Note that the default branch
+is `develop` (a `master` branch is still present, but far out of date).
+
+Build-time parameters can be chosen in `Makefile.rule`, see there for a short description of each option.
+Most options can also be given directly on the command line as parameters to your `make` or `cmake` invocation.
 
 ### Dependencies
 
@@ -60,6 +65,9 @@ For building with `cmake`, the usual conventions apply, i.e. create a build dire
 OpenBLAS source directory or separate from it, and invoke `cmake` there with the path to the source tree and any 
 build options you plan to set.
 
+For more details, see the [Building from source](http://www.openmathlib.org/OpenBLAS/docs/install/#building-from-source)
+section in the docs.
+
 ### Cross compile
 
 Set `CC` and `FC` to point to the cross toolchains, and if you use `make`, also set `HOSTCC` to your host C compiler.
@@ -76,10 +84,12 @@ Examples:
   make CC="i686-w64-mingw32-gcc -Bstatic" FC="i686-w64-mingw32-gfortran -static-libgfortran" TARGET=HASWELL BINARY=32 CROSS=1 NUM_THREADS=20 CONSISTENT_FPCSR=1 HOSTCC=gcc
   ```
 
-You can find instructions for other cases both in the "Supported Systems" section below and in the docs folder. The .yml scripts included with the sources (which contain the
+You can find instructions for other cases both in the "Supported Systems" section below and in
+the [Building from source docs](http://www.openmathlib.org/OpenBLAS/docs/install).
+The `.yml` scripts included with the sources (which contain the
 build scripts for the "continuous integration" (CI) build tests automatically run on every proposed change to the sources) may also provide additional hints.
 
-When compiling for a more modern CPU TARGET of the same architecture, e.g. TARGET=SKYLAKEX on a HASWELL host, option "CROSS=1" can be used to suppress the automatic invocation of the tests at the end of the build.
+When compiling for a more modern CPU target of the same architecture, e.g. `TARGET=SKYLAKEX` on a `HASWELL` host, option `CROSS=1` can be used to suppress the automatic invocation of the tests at the end of the build.
 
 ### Debug version
 
@@ -325,7 +335,7 @@ Please see Changelog.txt.
 
 ## Troubleshooting
 
-* Please read the [FAQ](https://github.com/OpenMathLib/OpenBLAS/docs/faq,md) in the docs folder first.
+* Please read the [FAQ](www.openmathlib.org/OpenBLAS/docs/faq) section of the docs first.
 * Please use GCC version 4.6 and above to compile Sandy Bridge AVX kernels on Linux/MinGW/BSD.
 * Please use Clang version 3.1 and above to compile the library on Sandy Bridge microarchitecture.
   Clang 3.0 will generate the wrong AVX binary code.
@@ -350,4 +360,4 @@ Please see Changelog.txt.
 
 ## Donation
 
-Please read [this wiki page](https://github.com/xianyi/OpenBLAS/wiki/Donation).
+Please see [the donations section](http://www.openmathlib.org/OpenBLAS/docs/about/#donations) in the docs.