Clarify README: what bld does, why it matters, and how it works

[Copilot]

The README was terse and unclear about bld’s purpose, impact, and operation. This update explains what the tool does, why it’s useful, and how it works, with pragmatic, lighthearted scenarios.

• Overview refresh
  • Describes bld as a .NET/msbuild Swiss Army knife
  • Outlines capabilities (clean, NuGet/TFM management, CPM, outdated, container scan)
• Value and approach
  • Highlights why it matters (disk savings, alignment, audits)
  • Summarizes how it works (MSBuild eval, dry-run defaults, conflict surfacing)
• Sample scenarios
  • Adds concise, ready-to-run examples for cleaning, dependency inventory, and TFM alignment

Example snippet:

# Nuke build bloat, safely
bld clean --root C:\src\MyRepo --depth 4 --obj

# Get a bird’s-eye view of dependencies
bld nuget --root . --aggregate --show-projects

# Align TFMs for modern SDKs
bld tfm --root MySolution.sln --to net9.0 --apply

Original prompt

the readme of this repo needs to make it much clearer a) what the tool does b) why that is important and helpful c) how it does it.
Add more samples and scenatios and insight and be a little ... not brash but ... also not really in your face but a bit lighthearted, cool, pragmatic

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