Announce validator registration, fix refs and links to Devnet, Testnet (

MystenLabs#3720)

doc/src/build/json-rpc.md

@@ -301,4 +301,4 @@ Below you can see a truncated sample output of [sui_publish](#sui_publish). One
 
 ## Connect to remote JSON-RPC server
 
-Coming soon - alternative ways of working with Sui's JSON-RPC API. Connect to Sui Devnet, Testnet, or Mainnet!
+Employ alternative ways of working with Sui's JSON-RPC API. Connect to [Sui Devnet](../explore/devnet.md), [Join Incentivized Testnet](https://sui.io/resources-sui/announcing-sui-incentivized-testnet/) and soon Mainnet!

doc/src/learn/index.md

@@ -18,14 +18,13 @@ built from the upstream `main` branch and therefore will contain updates not yet
 
 Find the latest updates to these contents in this section:
 
+* You can now [register to participate](https://airtable.com/shr3phh3FCZYhZUDF) in [Sui Incentivized Testnet as a validator](https://sui.io/resources-sui/validator-registration-open/)!
 * This site is now available in two versions in the menu at top left: the default and stable [Devnet](https://docs.sui.io/devnet/learn) branch and the [Latest build](https://docs.sui.io/learn) upstream `main` branch. Use the `devnet` version for app development on top of Sui. Use the Latest build `main` branch for  [contributing to the Sui blockchain](../contribute/index.md) itself. Always check and submit fixes to the `main` branch.
 * Sui now supports development using [Microsoft Windows 11, macOS, and Linux](../build/install.md#supported-oses). See [install Sui](../build/install.md#prerequisites) for the prerequisites of each operating system.
 * `sui::id` is now `sui::object` and `VersionedID` is now `Info`. Use the [Object module](https://github.com/MystenLabs/sui/blob/main/crates/sui-framework/sources/object.move) that has [replaced the former ID.move.](https://github.com/MystenLabs/sui/pull/3241)
 * Find a list of [single-writer apps](../learn/single-writer-apps.md) that would benefit from Sui's advantages in handling [simple transactions](../learn/how-sui-works.md#simple-transactions).
 * Sui [version 0.6.1](https://github.com/MystenLabs/sui/releases/tag/devnet-0.6.1) released to DevNet. See the [#sui-release-notes](https://discord.com/channels/916379725201563759/974444055259910174) channel in Discord for details on this and prior releases.
 * Install the [Sui Wallet Browser Extension](../explore/wallet-browser.md) to create NFTs, transfer coins, and carry out common transactions in a Chrome tab.
-* [Sui Move is feature complete](https://sui.io/resources-move/why-we-created-sui-move/) and ready for you to write safe and efficient smart contracts. See https://examples.sui.io/ to learn Sui Move by example.
-* If your application is written in JavaScript or TypeScript, follow the [TypeScript SDK documentation](https://github.com/MystenLabs/sui/tree/main/sdk/typescript) and [reference files](https://www.npmjs.com/package/@mysten/sui.js).
 
 For a complete view of all changes in the Sui `devnet` branch, see:
 https://github.com/MystenLabs/sui/commits/devnet

doc/src/navconfig.json

@@ -189,7 +189,7 @@
         "fileName": "explore/wallet-browser"
       },
       {
-        "label": "DevNet",
+        "label": "Devnet",
         "fileName": "explore/devnet"
       },
       {

doc/src/siteconfig.json

@@ -125,6 +125,11 @@
       {
         "name": "See what's New",
         "sublist": [
+          {
+            "name": "Apply to be a Validator",
+            "url": "https://sui.io/resources-sui/validator-registration-open/",
+            "external": true
+          },
           {
             "name": "Use Almost Any OS",
             "url": "/build/install#supported-oses"
@@ -143,11 +148,6 @@
             "url": "https://sui.io/resources-sui/announcing-enhanced-move-vs-code-plugin",
             "external": true
           },
-          {
-            "name": "Join Incentivized Testnet",
-            "url": "https://sui.io/resources-sui/announcing-sui-incentivized-testnet/",
-            "external": true
-          },
           {
             "name": "Run a Fullnode",
             "url": "/build/fullnode"