Remove submodule ui_suite_bootstrap_demo_tools

Problem/Motivation

.
├── Block
│   ├── HorizontalRuleBlock.php >> To avoid content entity in config
│   ├── SystemBrandingBlock.php
│   ├── SystemBreadcrumbBlock.php  >> Unnecessary because, we are "links" in setting type now
│   └── SystemMenuBlock.php  >> Unnecessary because we are "links" in setting type now
├── Field
│   └── FieldFormatter
│       ├── IntegerFormatter.php >> Replaced by 
            
              number_formatter →
             ?
│       ├── NumericFormatterBase.php  >> Replaced by 
            
              number_formatter →
            ?
│       ├── PatternWrapperStringFormatter.php >> Replaced by 
            
              ui_patterns_field_formatters →
            
│       ├── StringFormatter.php >> Customize HTML from 
            
              advanced_text_formatter →
            
│       └── TextFormatter.php >> Customize HTML from core String Formatter
├── HelpersSettingsTrait.php
├── Layout
│   └── InlineLayout.php >> Have a layout without a wrapper inside 
└── UiPatterns
    └── Source
        ├── BrandingSource.php
        ├── BreadcrumbSource.php  >> unnecessary because, we are "links" in setting type now
        └── MenuSource.php >> unnecessary because, we are "links" in setting type now