[#111]: Backport changes from ecosystem

[khalilcodes]

Backport changes to flowershow after ecosystem upgrade

Tasks from #111

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This PR adds changes in User config (for version), Navbar title, Dark/Light theme switcher, Search component and flowershow image assets.

Tasks

• Create _flowershow folder in public with images (logo and theme icon)
• Add navbarTitle object in siteConfig.js specific to flowershow stuff (title text, version, logo, etc) revert changes
• Create Navbar title function in components/Nav,js to render site title based off config values
  • values are from user's config.js and properties can be set in optional navbarTitle for text [String], logo [Boolean] and version [Boolean]
  • handle SEO title for both cases in pages/_app.js revert to previous config
• Add conditional rendering for Search component if docsearch configs exist (ie., appId, apiKey and indexName)
  • Add a env.development file with test values to render search component in development mode
• Add forced light theme and handle rendering of theme button based on config ie., if theme.default is an empty string
• Amend name of url path field to url_path in. contentlayer.config.js to avoid conflicts if any

Notes

• Searchbar component may not render in preview deploy as env variables will not be loaded. The searchbar rendering relies on having all three required algolia configs to be defined (ie. appId, apiKey and indexName) This works
• upgrade.sh package needs to be updated to remove .env.development file

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[rufuspollock]

I think code is ok for now though i have a few comments (don't need to change for them). Big thing missing is a bit of docs. I can do this quickly.

[rufuspollock]

surely navbarTitle is something like:

{
	title: 'Flowershow',
	logo: ...
	version: 'Alpha'
}

[rufuspollock]

Personally, i would be strict and say if you use navbarTitle you have to set title in their too i.e. this is:

if (navbarTitle) {
	use stuff from navbarTitle
} else {
      use siteConfig.title
}

Why? Explicitness is better than magic!