docs(core): improve core features and concepts

[juristr]

Wait with merging until this one is in: #19647
Then rebase to account for the new way of defining cacheableOperations.

This PR improves some of the core & concept docs and introduces a new "Tasks & Caching" recipe section. In particular

• Run tasks
  • minor additions about running tasks in parallel
  • improving task pipeline section
• Cache task results
  • improve header titles for better discoverability
  • add fine-tuning section for inputs/outputs
  • section about cache location and skipping caching, clearing etc..
• How Caching works
  • remove some of the details as they have been moved into the cache task results page or the new customizing inputs recipe
  • this page might still need some improvements in a follow-up PR
• Recipe: Fine-tuning Caching with Inputs
  • Removed the old "Customizing inputs" concept page as it was more of a recipe page showing how to achieve certain cache optimizations (although one could argue here, but it is more discoverable in the new place rather than "More Concepts")
• Concept: "What is a Task Pipeline"
  • reduced the content and focused on just the high level explanation and then extracted things into a new recipe 👇
  • Recipe: Defining a Task Pipeline
• Moved from Tips & Tricks into new Tasks & Caching section
  • Running custom commands
  • running root-level npm scripts
  • workspace watching
  • reduce repetitive configs
• Removed global installation concept page and Nx wrapper page into the Installation page

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 19, 2023 8:16pm

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• nx affected --target=e2e --base=470a0a302120b4d4b0ed1c6e9db8bf5700d8ae2a --head=f3be6c3a8ba98d3592808ad4f76e0b0583f0bf97 --parallel=1
• nx affected --targets=lint,test,build --base=470a0a302120b4d4b0ed1c6e9db8bf5700d8ae2a --head=f3be6c3a8ba98d3592808ad4f76e0b0583f0bf97 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=470a0a302120b4d4b0ed1c6e9db8bf5700d8ae2a --head=f3be6c3a8ba98d3592808ad4f76e0b0583f0bf97
• nx documentation --no-dte
• nx affected -t e2e-macos --parallel=1 --base=470a0a302120b4d4b0ed1c6e9db8bf5700d8ae2a --head=f3be6c3a8ba98d3592808ad4f76e0b0583f0bf97

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[isaacplmann]

I like the content. A few recipes should be split into separate pages. And I made wording changes across all the pages.

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