Removed doc.zih.tu-dresden.de/util/README.md.

Closes #334 (closed). For getting rid of the pipeline error, see !597 (merged).

doc.zih.tu-dresden.de/util/README.md

-# Check Scripts
-
-Several checks are in place to ensure a high quality and consistent documentation. These checks are
-run within the CI/CD pipeline and changes are only deployed to the HPC compendium, if the checks are
-passed. Thus, we highly recommend running the checks locally before committing and posing a merge
-request.
-
-* Markdown linter
-* Check internal and external links
-* Check code and command examples
-* Check no floating pages and depth of page tree
-
-## Markdown Linter
-
-The [markdown linter client](https://github.com/igorshubovych/markdownlint-cli) helps to keep the
-markdown source code clean and consistent.
-
-Installation
-
-```Shell Session
-~ npm install markdownlint-cli
-```
-
-The configuration is stored in `.markdownlintrc`.
-The tool `markdownlint` can be run in dry or fix mode.
-The *dry* mode (default) only outputs findings, whereas in *fix* mode it resolves basic
-errors directly in the markdown files.
-
-```Shell Session
-~ cd doc.zih.tu-dresden.de/
-~ markdownlint [--fix] docs/index.md
-docs/index.md:8:131 MD013/line-length Line length [Expected: 130; Actual: 138]
-```
-
-Before committing, invoke the script `util/lint-changes.sh` which calls the markdownlint tool for all
-(git-)changed markdown files.
-
-```Shell Session
-~ sh util/lint-changes.sh
-hpc-compendium-2.0-gitlab-tudzih git:(master) ✗ sh util/lint-changes.sh
-README.md:6 MD012/no-multiple-blanks Multiple consecutive blank lines [Expected: 1; Actual: 2]
-README.md:7 MD012/no-multiple-blanks Multiple consecutive blank lines [Expected: 1; Actual: 3]
-README.md:21 MD012/no-multiple-blanks Multiple consecutive blank lines [Expected: 1; Actual: 2]
-README.md:22 MD022/blanks-around-headings/blanks-around-headers Headings should be surrounded by blank lines [Expected: 1; Actual: 0; Below] [Context: "### Why is this not at gitlab.hrz.tu-chemnitz.de?"]
-[8< 8<]
-```
-
-## Check Links
-
-No one likes dead links. Therefore, we check the internal and external links within the markdown
-source files. For that, the script `util/check-links.sh` and/or the tool
-[markdown-link-check](https://github.com/tcort/markdown-link-check) can be used.
-
-Installation
-
-```Shell Session
-~ npm install markdown-link-check
-```
-
-```Shell Session
-~ cd doc.zih.tu-dresden.de/
-~ markdown-link-check docs/index.md
-
-FILE: docs/index.md
-[✖] http://141.76.17.11/hpc-wiki/bin/view/Compendium
-[✓] https://docs.olcf.ornl.gov/
-[✓] https://nersc.gitlab.io/
-[✓] https://www.mkdocs.org/
-[✓] https://docs.gitlab.com/runner/
-[✓] https://docs.gitlab.com/ee/user/project/pages/
-[✖] CONTRIBUTE.md
-
-7 links checked.
-
-ERROR: 2 dead links found!
-[✖] http://141.76.17.11/hpc-wiki/bin/view/Compendium → Status: 0
-[✖] CONTRIBUTE.md → Status: 400
-```
-
-### Usage
-
-Check links within changed git-versioned markdown files, invoke
-
-```Shell Session
-~ sh doc.zih.tu-dresden.de/util/check-links.sh
-```
-
-from top-level directory.
-
-To check all markdown files for broken links, invoke
-
-```Shell Session
-~ find . -name \*.md -exec markdown-link-check -q {} \;
-```
-
-## Check Code and Commands
-
-All code blocks and commands should be runnable from a login node.
-
-**TODO:** Implement [Issue #9](#9)
-
-## Check Pages Structure
-
-The script `check-no-floating.sh` contains two checks. It first checks the hierarchy depth of the
-pages structure. By design, no page in the documentation should be lower than four levels w.r.t. top
-level, i.e., landing page. Secondly, the script tests if every markdown file is included in the
-navigation section within the `mkdocs.yaml` file of this project.
-
-### Usage
-
-```bash
-sh doc.zih.tu-dresden.de/utils/check-no-floating.sh doc.zih.tu-dresden.de
-```
-
-### Return codes
-
-* -1/255 if any error occurs, 0 otherwise