rework: check description

docs: removed lines about plenary
removal: plenary
chore: optmized presets load to default nil as 'max'
rework: changed window format of manager and added coloring

Future plans: Add custom highlight-groups for Polydev to configure
border and background or manager

lua/Polydev/presets.lua

@@ -29,14 +29,7 @@ local presets = {
 ---@param preset string
 ---@return table|nil
 function M.getPresets(preset)
-    if presets[preset] ~= nil then
-	return presets[preset]
-    elseif presets[preset] == nil then
-	return nil
-    else
-	print("Preset option: " .. preset .. " does not exist")
-    end
-    return {}
+    return presets[preset]
 end
 
 return M