Revert "[release] change tag to main"

This reverts commit 5f33475.

Author: MarcelKoch

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.16)
 
 project(Ginkgo LANGUAGES CXX VERSION 1.9.0 DESCRIPTION "A numerical linear algebra library targeting many-core architectures")
-set(Ginkgo_VERSION_TAG "main")
+set(Ginkgo_VERSION_TAG "develop")
 set(PROJECT_VERSION_TAG ${Ginkgo_VERSION_TAG})
 if(Ginkgo_VERSION_TAG STREQUAL "master")
     set(GINKGO_VERSION_TAG_DEPRECATED ON)

README.md

@@ -2,11 +2,11 @@
 
 <div align="center">
 
-[![License](https://img.shields.io/github/license/ginkgo-project/ginkgo.svg)](./LICENSE)|[![c++ standard](https://img.shields.io/badge/c%2B%2B-17-blue.svg)](https://en.wikipedia.org/wiki/C%2B%2B#Standardization)|[![Documentation](https://img.shields.io/badge/Documentation-latest-blue.svg)](https://ginkgo-project.github.io/ginkgo-generated-documentation/doc/main/)|[![DOI](https://joss.theoj.org/papers/10.21105/joss.02260/status.svg)](https://doi.org/10.21105/joss.02260)
+[![License](https://img.shields.io/github/license/ginkgo-project/ginkgo.svg)](./LICENSE)|[![c++ standard](https://img.shields.io/badge/c%2B%2B-17-blue.svg)](https://en.wikipedia.org/wiki/C%2B%2B#Standardization)|[![Documentation](https://img.shields.io/badge/Documentation-latest-blue.svg)](https://ginkgo-project.github.io/ginkgo-generated-documentation/doc/develop/)|[![DOI](https://joss.theoj.org/papers/10.21105/joss.02260/status.svg)](https://doi.org/10.21105/joss.02260)
 |:-:|:-:|:-:|:-:|
 
 
-[![Build status](https://gitlab.com/ginkgo-project/ginkgo-public-ci/badges/main/pipeline.svg)](https://gitlab.com/ginkgo-project/ginkgo-public-ci/-/pipelines?page=1&scope=branches&ref=main)|[![OSX-build](https://github.com/ginkgo-project/ginkgo/actions/workflows/osx.yml/badge.svg)](https://github.com/ginkgo-project/ginkgo/actions/workflows/osx.yml)|[![codecov](https://codecov.io/gh/ginkgo-project/ginkgo/branch/main/graph/badge.svg)](https://codecov.io/gh/ginkgo-project/ginkgo)|[![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=ginkgo-project_ginkgo&metric=sqale_rating)](https://sonarcloud.io/dashboard?id=ginkgo-project_ginkgo)|[![Reliability Rating](https://sonarcloud.io/api/project_badges/measure?project=ginkgo-project_ginkgo&metric=reliability_rating)](https://sonarcloud.io/dashboard?id=ginkgo-project_ginkgo)|[![CDash dashboard](https://img.shields.io/badge/CDash-Access-blue.svg)](https://my.cdash.org/index.php?project=Ginkgo+Project)
+[![Build status](https://gitlab.com/ginkgo-project/ginkgo-public-ci/badges/develop/pipeline.svg)](https://gitlab.com/ginkgo-project/ginkgo-public-ci/-/pipelines?page=1&scope=branches&ref=develop)|[![OSX-build](https://github.com/ginkgo-project/ginkgo/actions/workflows/osx.yml/badge.svg)](https://github.com/ginkgo-project/ginkgo/actions/workflows/osx.yml)|[![codecov](https://codecov.io/gh/ginkgo-project/ginkgo/branch/develop/graph/badge.svg)](https://codecov.io/gh/ginkgo-project/ginkgo)|[![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=ginkgo-project_ginkgo&metric=sqale_rating)](https://sonarcloud.io/dashboard?id=ginkgo-project_ginkgo)|[![Reliability Rating](https://sonarcloud.io/api/project_badges/measure?project=ginkgo-project_ginkgo&metric=reliability_rating)](https://sonarcloud.io/dashboard?id=ginkgo-project_ginkgo)|[![CDash dashboard](https://img.shields.io/badge/CDash-Access-blue.svg)](https://my.cdash.org/index.php?project=Ginkgo+Project)
 |:-:|:-:|:-:|:-:|:-:|:-:|
 
 </div>
@@ -133,7 +133,7 @@ Ginkgo does comprehensive unit tests using Google Tests. These tests are enabled
 
 ### Running examples
 
-Various examples are available for you to understand and play with Ginkgo within the `examples/` directory. They can be compiled by passing the `-DGINKGO_BUILD_EXAMPLES=ON` to the cmake command. Each of the examples have commented code with explanations and this can be found within the [online documentation](https://ginkgo-project.github.io/ginkgo-generated-documentation/doc/main/Examples.html).
+Various examples are available for you to understand and play with Ginkgo within the `examples/` directory. They can be compiled by passing the `-DGINKGO_BUILD_EXAMPLES=ON` to the cmake command. Each of the examples have commented code with explanations and this can be found within the [online documentation](https://ginkgo-project.github.io/ginkgo-generated-documentation/doc/develop/Examples.html).
 
 ### Benchmarking