fix(docs): wide-table layout — stop clipping, fit backend table

[igorls]

Summary

Batched, browser-validated frontend fixes for wide tables in the docs.

The docs theme clipped any table wider than the content column instead of
letting it scroll — visible on the storage-backends compatibility table, whose
right-most columns were cut off and unreachable.

Root cause: the custom theme set .vp-doc table { overflow: hidden } to clip
the rounded corners, which also overrode VitePress's default overflow-x: auto.
With overflow hidden, columns that don't fit are simply unreachable.

Changes

.vitepress/theme/style.css (site-wide):

• .vp-doc table → overflow-x: auto (keeps rounded corners, restores
  horizontal scroll for any wide table — fixes clipping everywhere, not just one
  page).
• Denser table cells (8px 16px → 8px 12px) so comparison tables fit the
  content column without a scrollbar.
• overflow-wrap: break-word on table-cell code so only genuinely long values
  (e.g. a Postgres DSN) wrap, while short identifiers like palace_path keep
  natural column sizing and stay on one line.

guide/configuration.md:

• Drop the redundant Configure with column from the storage-backends table
  (each backend's connection variables are documented in full in its own
  subsection right below), shorten the capability headers, and
  Local (exact cosine) → Local (exact). The comparison table is now five
  columns and fits cleanly.

Validation (Playwright, dev server)

Measured scrollWidth/clientWidth and page overflow, plus visual screenshots,
at 1280px and 375px:

• No element clipping and no page-level horizontal overflow on the
  configuration, remote-server, reference (cli / mcp-tools / python-api),
  claude-code, and knowledge-graph pages.
• The storage-backends comparison table now fits the content column with no
  scroll at desktop; on mobile it scrolls within its own container.
• One subsection table (pgvector, long Postgres DSN) scrolls ~36px gracefully —
  reachable, never clipped.
• bun run docs:build — clean, no dead links.

[gemini-code-assist]

Code Review

This pull request enables horizontal scrolling for wide tables in the documentation by setting display: block and overflow-x: auto on tables, and simplifies table headers in the configuration guide. The feedback suggests updating the custom scrollbar CSS to include height: 6px; so that the horizontal scrollbar matches the customized thin appearance of the vertical scrollbar.

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[gemini-code-assist]

With overflow-x: auto now enabled to allow horizontal scrolling on wide tables, the horizontal scrollbar will become visible. However, the custom scrollbar styles defined at the bottom of this file (lines 200-207) only specify width: 6px; for ::-webkit-scrollbar.

In WebKit/Blink browsers, width only controls the vertical scrollbar thickness, while height controls the horizontal scrollbar thickness. Without specifying height: 6px;, the horizontal scrollbar on wide tables will render with the browser's default thick height, causing a visual inconsistency with the customized thin vertical scrollbars.

To fix this, please update the scrollbar rule at the bottom of the file as follows:

:::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}