Support Version/Language dropdown menu & custom CSS/JS support

[life1347]

Changes

Please describe the changes made in the pull request here.

This PR aims to add useful features, include

• Version dropdown menu
  • This implementation redirects user to any URL user specific, for example https://v0-2.lotusdocs.dev/, and user is responsible to add new DNS and hosting a site for out-of-date docs.
• Version warning banner
• Multilingual mode & dropdown menu
• Custom JS/CSS

Version dropdown menu

Multilingual mode

Banner for archived doc

Banner for unreleased doc

To enable these features, following config must be add to hugo.toml

defaultContentLanguage = 'en'
defaultContentLanguageInSubdir = true

[languages]
  [languages.en]
    contentDir = 'content/en'
    disabled = false
    languageCode = 'en-US'
    languageDirection = 'ltr'
    languageName = 'English'
    title = 'Project Documentation'
    weight = 2
    [languages.en.params]
      subtitle = 'Reference, Tutorials, and Explanations'

  [languages.zh-hant]
    contentDir = 'content/zh-hant'
    disabled = false
    languageCode = 'zh-Hant'
    languageDirection = 'ltr'
    languageName = '正體中文'
    title = 'Project Documentation'
    weight = 2
    [languages.zh-hant.params]
      subtitle = 'Reference, Tutorials, and Explanations'

[params]

  # CSS/JS for home page
  customCss = [] 
  customJs = []

  # CSS/JS for doc pages
  docCustomCss = ["css/custom.css"]
  docCustomJs = []

[params.versionInfo]
  dropdownMenuText = "Releases"
  archived = false                     # indicate this is an archived doc set branch and display warning banner - default false
  unreleased = true                   # indicate this is an unreleased doc set branch and display warning banner - default false

[[params.versions]]
  version = "Nightly"
  url = "https://nightly.lotusdocs.dev/"

[[params.versions]]
  version = "v0.1.0"
  current = true                       # display as current branch version

[[params.versions]]
  version = "v0.0.0"
  url = "https://v0-1.lotusdocs.dev/"

For Multilingual, language specific documentation must be placed in the content/<lang>/docs, like the following

To add custom CSS/JS, you must place files under static/css & static/js. For example, I add custom.css and the hugo.toml I've used is

  docCustomCss = ["css/custom.css"]
  docCustomJs = []

Below you'll find a checklist. For each item on the list, check one option and delete the other.

Dark mode

• [ V ] The UI has been tested both in dark and light mode
• [ X ] This PR does not change the UI

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