feat #55 enable upload widget instance methods (#78)

# Description

<!-- Include a summary of the change made and also list the dependencies
that are required if any -->
Updates the CldUploadWidtet component to enable all of the cloudinary
instance methods.

Also updates de CldUploadWidget documentation

## Issue Ticket Number

Fixes #55
Fixes #67 
Fixes #69 
Fixes #75 
Fixes #76 

<!-- Specify above which issue this fixes by referencing the issue
number (`#<ISSUE_NUMBER>`) or issue URL. -->
<!-- Example: Fixes
https://github.com/cloudinary-community/svelte-cloudinary/issues/<ISSUE_NUMBER>
-->

## Type of change

<!-- Please select all options that are applicable. -->

- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [x] Fix or improve the documentation
- [ ] This change requires a documentation update


# Checklist

<!-- These must all be followed and checked. -->

- [ ] I have followed the contributing guidelines of this project as
mentioned in [CONTRIBUTING.md](/CONTRIBUTING.md)
- [ ] I have created an
[issue](https://github.com/cloudinary-community/svelte-cloudinary/issues)
ticket for this PR
- [ ] I have checked to ensure there aren't other open [Pull
Requests](https://github.com/cloudinary-community/svelte-cloudinary/pulls)
for the same update/change?
- [ ] I have performed a self-review of my own code
- [ ] I have run tests locally to ensure they all pass
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes needed to the documentation

Author: matiasfha

docs/src/app.postcss

@@ -53,3 +53,5 @@
 [data-theme='night'] {
   --searchbox-bg: rgba(249,250,251,.1);
 }
+
+

docs/src/docs/components/cldogimage/usage.md

@@ -6,6 +6,7 @@ order: 1
 <script>
     import Callout from '$lib/components/Callout.svelte'
     import { CldOgImage, CldImage } from 'svelte-cloudinary'
+    import Video from '$lib/components/Video.svelte'
 </script>
 
 <CldOgImage
@@ -123,6 +124,12 @@ The CldOgImage component uses the same API as [CldImage](/CldImage/configuration
 </Callout>
 
 
+## Watch & Learn
+<Video
+title="Dynamic Social Cards in Svelte with Svelte Cloudinary - Dev Hints"
+url="https://www.youtube.com/watch?v=KsOtGDCocFs"
+/>
+
 ## Learn More about CldOgImage
 * [Configuration](/CldOgImage/configuration)
 * [Examples](/CldOgImage/examples)