[Read me] Updated screenshots in the overview for settings page (#5148)

* Updated images

* Updated shorcut guide image ref

* Updated image titles

* Uppercase to lowercase

* Added high res colorpicker images

* Updated extension

* Updated extensions

* Added Color Picker description

* Updated readme

* Removed CP section

* Update README.md

Co-authored-by: Niels Laute <niels9001@hotmail.com>

README.md

@@ -23,7 +23,7 @@ Microsoft PowerToys is a set of utilities for power users to tune and streamline
 
 ### File Explorer Add-ons (Preview Panes)
 
-[<img align="left" src="./doc/images/overview/PowerPreview_small.PNG" />](https://aka.ms/PowerToysOverview_FileExplorerAddOns) [File Explorer](https://aka.ms/PowerToysOverview_FileExplorerAddOns) add-ons right now are just limited to Preview Pane additions for File Explorer. Preview Pane is an existing feature in the File Explorer.  To enable it, you just click the View tab in the ribbon and then click "Preview Pane".
+[<img align="left" src="./doc/images/overview/PowerPreview_small.png" />](https://aka.ms/PowerToysOverview_FileExplorerAddOns) [File Explorer](https://aka.ms/PowerToysOverview_FileExplorerAddOns) add-ons right now are just limited to Preview Pane additions for File Explorer. Preview Pane is an existing feature in the File Explorer.  To enable it, you just click the View tab in the ribbon and then click "Preview Pane".
 
 PowerToys will now enable two types of files to be previewed: Markdown (.md) & SVG (.svg)
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@@ -47,7 +47,7 @@ PowerToys will now enable two types of files to be previewed: Markdown (.md) & S
 
 ### PowerRename
 
-[<img align="left" src="./doc/images/overview/PowerRename_small.PNG" />](https://aka.ms/PowerToysOverview_PowerRename) [PowerRename](https://aka.ms/PowerToysOverview_PowerRename) is a Windows Shell Extension for advanced bulk renaming using search and replace or regular expressions. PowerRename allows simple search and replace or more advanced regular expression matching. While you type in the search and replace input fields, the preview area will show what the items will be renamed to. PowerRename then calls into the Windows Explorer file operations engine to perform the rename. This has the benefit of allowing the rename operation to be undone after PowerRename exits. This code is based on [Chris Davis's SmartRename](https://github.com/chrdavis/SmartRename).
+[<img align="left" src="./doc/images/overview/PowerRename_small.png" />](https://aka.ms/PowerToysOverview_PowerRename) [PowerRename](https://aka.ms/PowerToysOverview_PowerRename) is a Windows Shell Extension for advanced bulk renaming using search and replace or regular expressions. PowerRename allows simple search and replace or more advanced regular expression matching. While you type in the search and replace input fields, the preview area will show what the items will be renamed to. PowerRename then calls into the Windows Explorer file operations engine to perform the rename. This has the benefit of allowing the rename operation to be undone after PowerRename exits. This code is based on [Chris Davis's SmartRename](https://github.com/chrdavis/SmartRename).
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 ### PowerToys Run
@@ -56,10 +56,11 @@ PowerToys will now enable two types of files to be previewed: Markdown (.md) & S
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 ### Shortcut Guide
 
-[<img align="left" src="./doc/images/overview/Shortcut guide_small.png" />](https://aka.ms/PowerToysOverview_ShortcutGuide)  [Windows key shortcut guide](https://aka.ms/PowerToysOverview_ShortcutGuide) appears when a user holds the Windows key down for more than one second and shows the available shortcuts for the current state of the desktop.
+[<img align="left" src="./doc/images/overview/ShortcutGuide_small.png" />](https://aka.ms/PowerToysOverview_ShortcutGuide)  [Windows key shortcut guide](https://aka.ms/PowerToysOverview_ShortcutGuide) appears when a user holds the Windows key down for more than one second and shows the available shortcuts for the current state of the desktop.
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