docs: review and edit new docs (#237)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **Documentation**
- Updated `docs/further.md` with extensive restructuring and detailed
guidance on installation, resource configuration, MPI, GPU, local
execution, advanced settings, and job nesting.
- Added comprehensive examples, best practices, and troubleshooting tips
for SLURM cluster interaction and resource management.

- **Chores**
- Updated the release announcement workflow to use a newer version of
the Mastodon release post action.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Christian Meesters <cmeesters@users.noreply.github.com>
Co-authored-by: meesters <meesters@uni-mainz.de>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: 3 people

.github/workflows/announce-release.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Post to Mastodon
-        uses: snakemake/mastodon-release-post-action@v1.2.3
+        uses: snakemake/mastodon-release-post-action@v1.4.0
         with:
           access-token: ${{ secrets.MASTODONBOT }}
           pr-title: ${{ github.event.head_commit.message }}