🩹 [Patch]: Update required modules + doc links (#37)

## Description

This pull request includes updates to the `NerdFonts` PowerShell module,
focusing on documentation enhancements, dependency updates, and
compatibility improvements. Below are the most important changes:

### Documentation Enhancements:
* Added `.LINK` and `.NOTES` sections to `Get-NerdFont` and
`Install-NerdFont` functions, providing links to the official NerdFonts
documentation and GitHub repository for better user guidance.
(`src/functions/public/Get-NerdFont.ps1`
[[1]](diffhunk://#diff-b3f6234dd4f55afe9de8daa4a7b43d8e17df21dbf18f9b96e2a32a950a1699caR23-R30)
`src/functions/public/Install-NerdFont.ps1`
[[2]](diffhunk://#diff-805a4a6beeb97eef72e8ff0b1bb90dee541f9da03df2803ab0a42416e5a8e794R31-R38)

### Dependency Updates:
* Updated the required version of the `Fonts` module from `1.1.19` to
`1.1.21` and added a new dependency on the `Admin` module with version
`1.1.6` in the `Install-NerdFont` function.
(`src/functions/public/Install-NerdFont.ps1`
[src/functions/public/Install-NerdFont.ps1L1-R2](diffhunk://#diff-805a4a6beeb97eef72e8ff0b1bb90dee541f9da03df2803ab0a42416e5a8e794L1-R2))

## Type of change

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [ ] 📖 [Docs]
- [ ] 🪲 [Fix]
- [x] 🩹 [Patch]
- [ ] ⚠️ [Security fix]
- [ ] 🚀 [Feature]
- [ ] 🌟 [Breaking change]

## Checklist

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas

Author: MariusStorhaug

src/functions/public/Get-NerdFont.ps1

@@ -20,6 +20,13 @@
         Get-NerdFonts -Name '*Code'
 
         Get the NerdFont with the name ending with 'Code'.
+
+        .LINK
+        https://psmodule.io/NerdFonts/Functions/Get-NerdFont
+
+        .NOTES
+        More information about the NerdFonts can be found at:
+        [NerdFonts](https://www.nerdfonts.com/) | [GitHub](https://github.com/ryanoasis/nerd-fonts)
     #>
     [Alias('Get-NerdFonts')]
     [OutputType([System.Object[]])]

src/functions/public/Install-NerdFont.ps1

@@ -1,4 +1,5 @@
-#Requires -Modules @{ ModuleName = 'Fonts'; RequiredVersion = '1.1.19' }
+#Requires -Modules @{ ModuleName = 'Fonts'; RequiredVersion = '1.1.21' }
+#Requires -Modules @{ ModuleName = 'Admin'; RequiredVersion = '1.1.6' }
 
 function Install-NerdFont {
     <#
@@ -27,6 +28,13 @@ function Install-NerdFont {
         Install-NerdFont -All
 
         Installs all Nerd Fonts to the current user.
+
+        .LINK
+        https://psmodule.io/NerdFonts/Functions/Install-NerdFont
+
+        .NOTES
+        More information about the NerdFonts can be found at:
+        [NerdFonts](https://www.nerdfonts.com/) | [GitHub](https://github.com/ryanoasis/nerd-fonts)
     #>
     [CmdletBinding(
         DefaultParameterSetName = 'ByName',