Polishing settings styles (#2534)

* Polishing settings css

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Fixing inputs border-radius

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Removing Box component

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Removing unused import

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Remove content region style fixes

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Revert theme colors

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Set new colors in theme files

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

* Change Cluster extectedText

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

integration/__tests__/cluster-pages.tests.ts

@@ -91,7 +91,7 @@ describe("Lens cluster pages", () => {
           name: "Cluster",
           href: "cluster",
           expectedSelector: "div.ClusterOverview div.label",
-          expectedText: "Master"
+          expectedText: "CPU"
         }]
       },
       {