Merge pull request #3301 from SGSSGene/fix/README

fix, doc: we don't have to talk about submodules anymore

Author: eseiler

README.md

@@ -88,7 +88,7 @@ We recommend that you use CMake to build your project:
 
 Quick-Setup without CMake:
 
-  * Clone the repository with submodules: `git clone --recurse-submodules https://github.com/seqan/seqan3.git`
+  * Clone the repository: `git clone https://github.com/seqan/seqan3.git`
   * Add the following to your compiler invocation:
     * the include directories of SeqAn and its dependencies
     * C++20 mode
@@ -98,8 +98,7 @@ Quick-Setup without CMake:
 g++-11 -O3 -DNDEBUG -Wall -Wextra                               \
     -std=c++20                                                  \
     -I       /path/to/seqan3/include                            \
-    -isystem /path/to/seqan3/submodules/sdsl-lite/include       \
-    -isystem /path/to/seqan3/submodules/cereal/include          \
+    -isystem /path/to/sdsl-lite/include                         \
     -DSEQAN3_HAS_ZLIB=1 -DSEQAN3_HAS_BZIP2=1                    \
     -lz -lbz2 -pthread                                          \
   your_file.cpp

doc/setup/library_tests/index.md

@@ -19,7 +19,7 @@ Before submitting a pull request to our repository, make sure that the unit test
 
 ## Setting up unit tests
 
-Assume that you have cloned SeqAn including submodules into `/home/me/devel/seqan3` and performed some local changes.
+Assume that you have cloned SeqAn into `/home/me/devel/seqan3` and performed some local changes.
 
 Create an out-of-source build directory and change to it:
 

doc/setup/quickstart_cmake/index.md

@@ -81,7 +81,6 @@ hours of use per month, which is plenty for our tutorials. A GitHub account is r
 - <b class="tab-title">Using GitHub Codespaces</b>
 [GitHub Codespaces](https://github.com/codespaces) offer a service similar to gitpod, including a free monthly quota.
 [Click here](https://codespaces.new/seqan/seqan3) to open SeqAn3 in Codespaces.
-Please note that you may have to manually clone the submodules by running `git submodule update --init`.
 
 </div>
 <br>
@@ -104,13 +103,13 @@ tutorial
 └── seqan3
 ```
 
-To set these directories up you can follow this script (note the <b>\--recurse-submodules</b> when cloning SeqAn3):
+To set these directories up you can follow this script:
 ```bash
 mkdir tutorial
 cd tutorial
 mkdir build
 mkdir source
-git clone --recurse-submodules https://github.com/seqan/seqan3.git
+git clone https://github.com/seqan/seqan3.git
 ```
 
 The output of the command `tree -L 2` should now look like this:
@@ -230,11 +229,6 @@ target_link_libraries (my_app PUBLIC seqan3::seqan3)
   ```
   and run `cmake` again.
 
-* **SDSL library not found**: `The SDSL library is required, but wasn't found.`<br>
-  The repository was not cloned correctly. This can be verified by checking whether
-  `submodules/sdsl-lite/include/version.hpp` exists.
-  If it does not, try running `git submodule update --init` within the seqan3 directory.
-
 * **Incorrect compiler**: `Your compiler is not supported.` or `Only GCC is supported.`<br>
   The incorrect compiler is used (e.g., Apple Clang instead of GCC). Be sure to set `-DCMAKE_CXX_COMPILER=`. For an
   example, see \ref remark_cmake_cxx_compiler "this remark".