🩹 [Patch]: Update required modules + doc links (#49)

## Description

This pull request introduces updates to improve documentation for
PowerShell functions, update module dependencies, and clean up the
project manifest. Below is a breakdown of the most significant changes:

### Documentation Enhancements:
* Added `.LINK` and `.NOTES` sections to the `Get-GoogleFont` function
to provide additional resources and context, including links to the
function's documentation and the Google Fonts GitHub repository.
(`src/functions/public/Get-GoogleFont.ps1`,
[src/functions/public/Get-GoogleFont.ps1R23-R29](diffhunk://#diff-86091f30b4dfb1604e5f505f18809aad419502a27c58272d2eb24defcacf6b37R23-R29))
* Added `.LINK` and `.NOTES` sections to the `Install-GoogleFont`
function for similar purposes, enhancing the function's usability and
clarity. (`src/functions/public/Install-GoogleFont.ps1`,
[src/functions/public/Install-GoogleFont.ps1R31-R37](diffhunk://#diff-f926b03377b12f05eed72cf360452ff4ac9b8f4a2c7c858e02068ea43cc050a5R31-R37))

### 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 a
required version of `1.1.6`, ensuring compatibility and new
functionality. (`src/functions/public/Install-GoogleFont.ps1`,
[src/functions/public/Install-GoogleFont.ps1L1-R2](diffhunk://#diff-f926b03377b12f05eed72cf360452ff4ac9b8f4a2c7c858e02068ea43cc050a5L1-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-GoogleFont.ps1

@@ -20,6 +20,13 @@
         Get-GoogleFonts -Name 'Noto*'
 
         Get the GoogleFont with the name starting with 'Noto'.
+
+        .LINK
+        https://psmodule.io/GoogleFonts/Functions/Get-GoogleFont
+
+        .NOTES
+        More information about the GoogleFonts can be found at:
+        [GoogleFonts](https://fonts.google.com/) | [GitHub](https://github.com/google/fonts)
     #>
     [Alias('Get-GoogleFonts')]
     [OutputType([System.Object[]])]

src/functions/public/Install-GoogleFont.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-GoogleFont {
     <#
@@ -27,6 +28,13 @@ function Install-GoogleFont {
         Install-GoogleFont -All
 
         Installs all Google Fonts to the current user.
+
+        .LINK
+        https://psmodule.io/GoogleFonts/Functions/Install-GoogleFont
+
+        .NOTES
+        More information about the GoogleFonts can be found at:
+        [GoogleFonts](https://fonts.google.com/) | [GitHub](https://github.com/google/fonts)
     #>
     [CmdletBinding(
         DefaultParameterSetName = 'ByName',