Adds a description and diagram for FSC salaries

[bethaniley]

This PR adds a description and diagram showing how FSCs should budget salaries.

👍🎉 First of all, thanks for taking the time to contribute! 🎉👍

FOR CONTRIBUTOR

• I have read the CONTRIBUTING.md document

PR Type:

• This PR adds a new blog post
• This PR does something else (explain above)

FOR REVIEWERS

Thanks for taking the time to review! ❤️

Here are the list of things to make sure of:

• The website builds (a check will fail if not)
• All images have been added within the Pull Request and they have Alt text
• If there are paragraphs or text, the key messages are highlighted
• All internal links (within OLS website) use the {% link path_to_file.md %} format
• The preview corresponds to the changes described in the Pull Request
• The code is tidy and passes the linting tests

[bethaniley]

@yochannah and/or @pherterich, please check whether the content is accurate!

@NPDebs, please check that my picture actually displays, I have no idea what I'm doing 😅

[pherterich]

It bugs me that there are 2 bars that look the same to me, but one is representing 15% and one is 45% 😅 I don't know if this a GitHub display issue or in the original source, but the fact that those are not to scale does not work for me.

[bethaniley]

So the blue parts of the bars should be bigger, like this? @pherterich