Feature: Update nav bar design

[Bilelkihal]

Problems

• Nav bar don't tell about the current page (activated page)
• Bad styling

Solution

• A better alignement
• Showing the active item differently (the current page)
• Add a search field
• Add a select to choose the language of the portal

todo

• Fix the problems of responsiveness

Screenshots

before

After

[syphax-bouazzouni]

thinks of a way to get the portal languages, and not put static ones

[syphax-bouazzouni]

instead of using this js code, use directly bootstrap if possible or a stimulus controller (or add it to an existent old js file )

[Bilelkihal]

It's not possible to use bootstrap with the existing code,
It's better to keep the existing js lines like this, cause It uses querySelectorAll with 8 classes, adding it as targets in stimulus will just complicate things.

[syphax-bouazzouni]

Remove these two commits for this branch they are not related to this branch

[syphax-bouazzouni]

Note for me: this PR needs changes in our configuration files and locales

The new $HOME_PAGE_LOGOS configuration :

$HOME_PAGE_LOGOS = {
  supported_by: [
    {
      img_src: 'logos/supports/numev.png',
      url: 'http://www.lirmm.fr/numev',
      target: '_blank',
    },
    {
      img_src: 'logos/supports/anr.png',
      url: 'https://anr.fr/en',
      target: '_blank',
    },
    {
      img_src: 'logos/supports/eu.png',
      url: 'https://commission.europa.eu/research-and-innovation_en',
      target: '_blank',
    }
  ],
  with_the_collaboration_of: [
    {
      img_src: 'logos/collaboration/d2kab.png',
      url: 'http://d2kab.mystrikingly.com',
      target: '_blank',
    },
    {
      img_src: 'logos/collaboration/lirmm.png',
      url: 'http://www.lirmm.fr',
      target: '_blank',
    },
    {
      img_src: 'logos/collaboration/inrae.png',
      url: 'https://www.inrae.fr/enm',
      target: '_blank',
    },
    {
      img_src: 'logos/collaboration/stanford.png',
      url: 'https://www.stanford.edu',
      target: '_blank',
    },
  ]
}

The new locales

index:
      tagline: The home of vocabularies and ontologies in agronomy and related fields.
      welcome: Welcome to %{site},

[syphax-bouazzouni]

Some modifications that I did:

• Add dropdown button component](0e336ba)
• Update portalname helper to use $SITE config variable](ceec0ae)
• Extract top nav responsiveness to a stimulus controller](40984ac)
• Use the dropdown component in the topnav for the support link](04e0aab)
• Hide topnav search input if the current page is the home](5348271)
• Add again the platform-language controller to topnav language selector](f31321d)
• Add for logged users the account settings dropdown to the topnav (0c23f66)