docs(weave): Refactor Evals and Scoring section

[J2-D2-3PO]

Description

https://wandb.atlassian.net/browse/DOCS-1062

Refactor of https://weave-docs.wandb.ai/guides/core-types/evaluations and https://weave-docs.wandb.ai/guides/evaluation/scorers

• Separates https://weave-docs.wandb.ai/guides/evaluation/scorers into 3 logical subpages under new header Scorers and renames evaluations folder to scorers. Reasons: findability, readability, Tim's loom classifies the scorer as the top level construct that powers evals, guardrails, and monitoring, so the docs should reflect this
  • Existing https://weave-docs.wandb.ai/guides/evaluation/scorers#how-scorers-work becomes new subpage Using Scorers in Evaluation Workflows
  • Existing https://weave-docs.wandb.ai/guides/evaluation/scorers#predefined-scorers becomes new subpage Predefined Scorers
  • Existing https://weave-docs.wandb.ai/guides/evaluation/scorers#create-your-own-scorers becomes Custom Scorers
  • Existing How Scorers Work section content from https://weave-docs.wandb.ai/guides/evaluation/scorers#how-scorers-work moved to new page Working With Scorers that also includes usage info from Nvidia NB

• Updates language, grammar, formatting, typos, etc.
• Replaces use of ** for subheaders with linkable MD headers
• Updates https://weave-docs.wandb.ai/guides/core-types/evaluations to reflect the page breakup

Other changes

• Modifies non-docs files to correct links with parent folder name change
  modified: weave-js/src/components/PagePanelComponents/Home/Browse3/pages/ScorersPage/ScorerForms.tsx modified: weave-js/src/components/PagePanelComponents/Home/Browse3/pages/common/EmptyContent.tsx
• Also fixes random broken anchors in unrelated pages that surfaced from local yarn docusaurus build:

Exhaustive list of all broken anchors found:
- Broken anchor on source page path = /guides/tracking/tracing:
   -> linking to /reference/python-sdk/weave/#function-attributes
- Broken anchor on source page path = /reference/python-sdk/weave/:
   -> linking to #function-attributes (resolved as: /reference/python-sdk/weave/#function-attributes)

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[J2-D2-3PO]

@tssweeney, what if we merge your #3344 into this PR and ship everything at once (assuming timing works out)? I'd have to make a few mods to fithttps://github.com/wandb/weave/blob/49b32c00a15ab7989f99af43e11a8dead26a5c6c/docs/docs/guides/evaluation/guardrails_and_monitors.md in to the new structure, but it seems like it would fit logically in the new structure. LMK what you think

...
LLM Application Tracing
Scorers
    Evaluations
    Guardrails <- guardrails_and_monitors.md
    Built-in Scorers
    Custom scorers
    Working With Scorers
Prompts
...