docs: rename Tool Config to Built-in Tools, reorder tools nav

Move Overview to top, Custom Tools to bottom, and add Built-in Tools
row to the tools overview table.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ppradnesh

docs/docs/configure/tools/index.md

@@ -4,6 +4,7 @@ Altimate Code has 55+ specialized tools organized by function.
 
 | Category | Tools | Purpose |
 |---|---|---|
+| [Built-in Tools](config.md) | — | File operations, search, shell, subagents, and other core agent tools |
 | [SQL Tools](sql-tools.md) | 12 tools | Analysis, optimization, translation, formatting, cost prediction |
 | [Schema Tools](schema-tools.md) | 7 tools | Inspection, search, PII detection, tagging, diffing |
 | [FinOps Tools](finops-tools.md) | 8 tools | Cost analysis, warehouse sizing, unused resources, RBAC |

docs/mkdocs.yml

@@ -67,15 +67,15 @@ nav:
           - Agent Modes: configure/agent-modes.md
           - Agent Config: configure/agents.md
       - Tools:
-          - Tool Config: configure/tools/config.md
-          - Custom Tools: configure/tools/custom.md
           - Overview: configure/tools/index.md
+          - Built-in Tools: configure/tools/config.md
           - SQL Tools: configure/tools/sql-tools.md
           - Schema Tools: configure/tools/schema-tools.md
           - FinOps Tools: configure/tools/finops-tools.md
           - Lineage Tools: configure/tools/lineage-tools.md
           - dbt Tools: configure/tools/dbt-tools.md
           - Warehouse Tools: configure/tools/warehouse-tools.md
+          - Custom Tools: configure/tools/custom.md
       - Skills: configure/skills.md
       - Commands: configure/commands.md
       - Providers & Models: