Fix broken links.

Author: jasonmarcher

README.md

@@ -2,15 +2,15 @@
 
 Powertab is an extension of the PowerShell [tab expansion](http://docs.microsoft.com/en-us/powershell/scripting/core-powershell/console/using-tab-expansion?view=powershell-6) feature.
 
-![Example of PowerTab in use.](Docs/powertab-demo.gif)
+![Example of PowerTab in use.](docs/powertab-demo.gif)
 
 PowerTab offers enhanced tab expansion for PowerShell.
 
 **Major Features:**
 - **Context Sensitive** - Leverages the PowerShell parser for context appropriate tab expansion.
-- **Extensible** - Offers extension points for additional contexts, such as other PowerShell modules or native applications, with [Tab Expansion Handlers](Docs/Development/Handlers.md).
-- **Supports Many PowerShell Hosts** - Works in any PowerShell host that runs tab expansion. See the [Host Support](Docs/Usage/HostSupport.md) page.
-- **New Interfaces** - Offers several GUI options for displaying tab expansion options using [Tab Item Selectors](Docs/Usage/ItemSelectors.md).
+- **Extensible** - Offers extension points for additional contexts, such as other PowerShell modules or native applications, with [Tab Expansion Handlers](docs/Development/Handlers.md).
+- **Supports Many PowerShell Hosts** - Works in any PowerShell host that runs tab expansion. See the [Host Support](docs/Usage/HostSupport.md) page.
+- **New Interfaces** - Offers several GUI options for displaying tab expansion options using [Tab Item Selectors](docs/Usage/ItemSelectors.md).
 
 ## Install
 
@@ -29,11 +29,11 @@ Install-Module -Name PowerTab
 ## Help Index
 
 - Setup
-  - [Installing PowerTab](Docs/Setup/Install.md)
-  - [Configuration File Location](Docs/Setup/ConfigFile.md)
-  - [Tab Expansion Database](Docs/Setup/TabDatabase.md)
+  - [Installing PowerTab](docs/Setup/Install.md)
+  - [Configuration File Location](docs/Setup/ConfigFile.md)
+  - [Tab Expansion Database](docs/Setup/TabDatabase.md)
 - User Interface
-  - [Tab Item Selectors](Docs/Usage/ItemSelectors.md)
-  - [Host Support](Docs/Usage/HostSupport.md)
+  - [Tab Item Selectors](docs/Usage/ItemSelectors.md)
+  - [Host Support](docs/Usage/HostSupport.md)
 - Development
-  - [Tab Expansion Handlers](Docs/Development/Handlers.md)
+  - [Tab Expansion Handlers](docs/Development/Handlers.md)