pages/*, style-guide: update contents, fix Markdown (#10492)

* pages/*, style-guide: update pages, fix Markdown (commit 1)

* Update pages

* style-guide.de: update page

* Apply suggestions from code review

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* pip3: remove search command

* rpm: update path placeholder

Co-authored-by: pixel <pixel+github@chrissx.de>

* Update pages/linux/pkgfile.md

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

---------

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>
Co-authored-by: pixel <pixel+github@chrissx.de>

pages/linux/yaourt.md

@@ -9,15 +9,15 @@
 
 - Install a new package (includes AUR):
 
-`yaourt -S {{package_name}}`
+`yaourt -S {{package}}`
 
 - Remove a package and its dependencies (includes AUR packages):
 
-`yaourt -Rs {{package_name}}`
+`yaourt -Rs {{package}}`
 
 - Search the package database for a keyword (including AUR):
 
-`yaourt -Ss {{package_name}}`
+`yaourt -Ss {{query}}`
 
 - List installed packages, versions, and repositories (AUR packages will be listed under the repository name 'local'):