Suggestions for Licence tab in About Screen
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#### Summary:
<!-- Summarize the issue/suggestion concisely: -->
Copy pasting from https://gitlab.com/inkscape/inkscape/-/merge_requests/1186#note_365954382
I would suggest having:
- a link to [license page][1] (similar to how it is in other pages), and
- having something said about Files made using Inkscape
- therefore, a separate heading for Software licence would be required too (similar to the license web page)
[1]: https://inkscape.org/about/license/
<details>
<summary>Illustrations</summary>
| Target | Inspiration |
| ------ | ------ |
| ![2] | ![3] |
[2]: https://gitlab.com/inkscape/inkscape/uploads/5ba20bde6a9a1a566740c4f602e98841/image.png
[3]: https://gitlab.com/inkscape/inkscape/uploads/7e91c8849fa1d1186052b9019dc5106c/image.png
</details>
#### Progress:
**Please proceed as mentioned in the note in the starting of this description.**
- [x] [Topic1](https://gitlab.com/inkscape/ux/-/issues/36#note_381791172): Version of the license
- [x] [Topic2](https://gitlab.com/inkscape/ux/-/issues/36#note_381791570): Formatting text
- [x] [Topic3](https://gitlab.com/inkscape/ux/-/issues/36#note_381792117): Empty copyright info
- [x] [Topic4](https://gitlab.com/inkscape/ux/-/issues/36#note_390251527): Updated Glade UI + content
issue