feat: add option to pass directory to site.Params.math.katex.assets

[Keonik1]

Problem

In params.math.katex.assets, you have to specify a whole list of files, which is inconvenient if there are many of them (such as fonts), because it bloats the hugo.yaml file

Solution

Added the ability to specify a directory so that all files in it are included, without having to list every file individually (combined approaches also work)

Before

# hugo.yaml
params:
  math:
    engine: katex
    katex:
      css: “css/katex.min.css”
      assets:
        - css/fonts/KaTeX_AMS-Regular.ttf
        - css/fonts/KaTeX_AMS-Regular.woff
        - css/fonts/KaTeX_AMS-Regular.woff2
        - css/fonts/KaTeX_Caligraphic-Bold.ttf
        ...

Now

# hugo.yaml
params:
  math:
    engine: katex
    katex:
      css: “css/katex.min.css”
      assets:
        - css/fonts/

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