improve documentation

[btel]

What

Documentation is essential for every project. Read through the docs and find any errors, undocumented functions and maybe add more tutorials, examples

How

the docs are available at https://svgutils.readthedocs.io/en/latest/index.html, go through them and if you want to modify anything check click on "edit on github" in the upper right corner and edit the file directly through github interface. you don't even need to clone the repository locally, most things can be done from the browser.

if you haven't used sphinx and restructured text check out the tutorials:

https://www.sphinx-doc.org/en/master/usage/quickstart.html

https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html

[abhisht51]

I am making a few changes like changing the tone of the document and turning it into third person.