feat: add sectionsTitles parameter

[davlgd]

If the website is composed of multiple sections, we could want to define different titles templates for each of them. For example:

• documentation: Title - My documentation
• blog: Title - My blog
• guides: Title - My guides

With this PR, the user can define a new entry params, sectionsTitles to define per section title, used in the title of section pages. If none is defined, the default title is used.

Example:

title: My documentation

params:
  sectionTitles: 
    blog: My blog
    guides: My guides

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[imfing]

thanks! we need to take into account that our site supports multiple languages.
the current approach might not work for multi-language sites. we should probably figure out a different approach.

[davlgd]

thanks! we need to take into account that our site supports multiple languages. the current approach might not work for multi-language sites. we should probably figure out a different approach.

For multi-languages it works too, you just have to put sectionTitles in a languages > lang code > params section. For example for a french version of above parameters:

languages:
  fr:
    params: 
      sectionTitles: 
        blog: Mon blog
        guides: Mes guides

As mentionned in Hugo documentation (v0.112.0+):
https://gohugo.io/content-management/multilingual/#changes-in-hugo-01120