refactor: move contracts under Build > API, merge manuals into guides (#121)

- Move docs/contracts/ to docs/build/api/contracts/ with Deployed
Addresses as the section index (skip vendor README)
  - Merge docs/manuals/ into docs/guides/manuals/
  - Remove Contracts and Manuals navbar links
  - Remove contractsSidebar and manualsSidebar
  - Update sync-contracts-docs.js output path and sidebar references
  - Update homepage and supported-chains links

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Documentation**
* Reorganized API documentation structure for improved discoverability
within the Build section.
  * Relocated Manuals content to the Guides section.
  * Updated documentation navigation and sidebar hierarchy.
  * Simplified overall documentation layout and cross-references.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Maharshi Mishra <ihsraham27@gmail.com>

Author: mod

docs/build/api/_category_.json

@@ -0,0 +1,9 @@
+{
+  "label": "API",
+  "position": 3,
+  "link": {
+    "type": "generated-index"
+  },
+  "collapsible": false,
+  "collapsed": false
+}

docs/build/api/contracts/_category_.json

@@ -0,0 +1,10 @@
+{
+  "label": "Contracts",
+  "position": 1,
+  "link": {
+    "type": "doc",
+    "id": "build/api/contracts/index"
+  },
+  "collapsible": false,
+  "collapsed": false
+}

…/contracts/api-reference/_category_.json …/contracts/api-reference/_category_.jsondocs/contracts/api-reference/_category_.json renamed to docs/build/api/contracts/api-reference/_category_.json docs/contracts/api-reference/_category_.json renamed to docs/build/api/contracts/api-reference/_category_.json

@@ -2,7 +2,7 @@
 title: "AppRegistry"
 description: "App builder registry with slashing."
 sidebar_position: 4
-displayed_sidebar: contractsSidebar
+displayed_sidebar: buildSidebar
 ---
 
 # AppRegistry

…/contracts/api-reference/app-registry.md …/contracts/api-reference/app-registry.mddocs/contracts/api-reference/app-registry.md renamed to docs/build/api/contracts/api-reference/app-registry.md docs/contracts/api-reference/app-registry.md renamed to docs/build/api/contracts/api-reference/app-registry.md

@@ -2,7 +2,7 @@
 title: "Faucet"
 description: "Testnet token faucet."
 sidebar_position: 7
-displayed_sidebar: contractsSidebar
+displayed_sidebar: buildSidebar
 ---
 
 # Faucet

docs/contracts/api-reference/faucet.md …ld/api/contracts/api-reference/faucet.mddocs/contracts/api-reference/faucet.md renamed to docs/build/api/contracts/api-reference/faucet.md docs/contracts/api-reference/faucet.md renamed to docs/build/api/contracts/api-reference/faucet.md

@@ -2,7 +2,7 @@
 title: "ILock"
 description: "Lock/unlock/withdraw interface."
 sidebar_position: 1
-displayed_sidebar: contractsSidebar
+displayed_sidebar: buildSidebar
 ---
 
 # ILock

…api-reference/interfaces/_category_.json …api-reference/interfaces/_category_.jsondocs/contracts/api-reference/interfaces/_category_.json renamed to docs/build/api/contracts/api-reference/interfaces/_category_.json docs/contracts/api-reference/interfaces/_category_.json renamed to docs/build/api/contracts/api-reference/interfaces/_category_.json

@@ -2,7 +2,7 @@
 title: "ISlash"
 description: "Slashing interface."
 sidebar_position: 2
-displayed_sidebar: contractsSidebar
+displayed_sidebar: buildSidebar
 ---
 
 # ISlash

…tracts/api-reference/interfaces/ilock.md …tracts/api-reference/interfaces/ilock.mddocs/contracts/api-reference/interfaces/ilock.md renamed to docs/build/api/contracts/api-reference/interfaces/ilock.md docs/contracts/api-reference/interfaces/ilock.md renamed to docs/build/api/contracts/api-reference/interfaces/ilock.md

@@ -2,7 +2,7 @@
 title: "Locker"
 description: "Abstract lock/unlock/withdraw state machine."
 sidebar_position: 2
-displayed_sidebar: contractsSidebar
+displayed_sidebar: buildSidebar
 ---
 
 # Locker

…racts/api-reference/interfaces/islash.md …racts/api-reference/interfaces/islash.mddocs/contracts/api-reference/interfaces/islash.md renamed to docs/build/api/contracts/api-reference/interfaces/islash.md docs/contracts/api-reference/interfaces/islash.md renamed to docs/build/api/contracts/api-reference/interfaces/islash.md

@@ -2,7 +2,7 @@
 title: "NodeRegistry"
 description: "Node operator registry with voting power."
 sidebar_position: 3
-displayed_sidebar: contractsSidebar
+displayed_sidebar: buildSidebar
 ---
 
 # NodeRegistry