fix: revert the main content style (#714)

Co-authored-by: Jorge Martinez <jorge.martinezgarrido@ansys.com>
Co-authored-by: pyansys-ci-bot <92810346+pyansys-ci-bot@users.noreply.github.com>
Co-authored-by: Jorge Martínez <28702884+jorgepiloto@users.noreply.github.com>
Co-authored-by: Roberto Pastor Muela <37798125+RobPasMue@users.noreply.github.com>

Author: 4 people

doc/changelog.d/714.fixed.md

@@ -0,0 +1 @@
+revert the main content style

src/ansys_sphinx_theme/assets/styles/ansys-sphinx-theme.scss

@@ -51,10 +51,6 @@ p.rubric {
     text-align: center;
 }
 
-.bd-main .bd-content {
-    justify-content: center;
-}
-
 /* Back to top button */
 #pst-back-to-top {
     background: var(--ast-color-active-text);