Update version_notes.adoc with v0.13 versions on testnets (#1023)

* Update version_notes.adoc with v0.13 versions on testnets

* Update version_notes.adoc

* SME Comments

* Removed upcoming versions from TOC, added text to point to Starknet Roadmap.

* Apply suggestions from code review

* Update components/Starknet/modules/starknet_versions/pages/version_notes.adoc

---------

Co-authored-by: Steve Goodman <steve@starkware.co>
Co-authored-by: Steve Goodman <39279277+stoobie@users.noreply.github.com>

components/Starknet/modules/starknet_versions/nav.adoc

@@ -1,5 +1,4 @@
 * Versions
 ** xref:version_notes.adoc[Starknet release notes]
-** xref:upcoming_versions.adoc[Upcoming Starknet versions]
+// ** xref:upcoming_versions.adoc[Upcoming Starknet versions]
 ** xref:deprecated.adoc[Deprecated, unsupported, and removed features]
- 

components/Starknet/modules/starknet_versions/pages/upcoming_versions.adoc

@@ -1,32 +1,9 @@
 [id="upcoming_versions"]
-
 = Upcoming Starknet versions
 
 [id="what_to_expect"]
-== Starknet Alpha v0.13.0
-
-
-This version introduces the following changes:
-
-* In addition to ETH, users will be able to pay transaction fees in STRK using v3 transactions.
-* v3 transactions are structured to support several upcoming features detailed below.
-
-=== v3 transactions
-
-[IMPORTANT]
-====
-While v3 transactions will support the following features, not all the features that they will support will be available in Starknet v0.13.0.
-====
-
-* A *fee market*, starting with Starknet v0.14.0, to enable users to optimize their transaction process by the network during periods of congestion.
-* A *paymaster* mechanism, to enable entities other than the transaction sender to pay transaction fees.
-* Account deployment will take place with an account’s initial Invoke or Declare transaction.
-* *Volition mode*, for reducing data availability costs.
-* *Nonce generalization*, enabling users to send multiple transactions simultaneously by specifying different channels for different transactions.
-
-For more information, see the following:
-
-* link:https://github.com/starknet-io/SNIPs/blob/main/SNIPS/snip-8.md[SNIP 8: Transaction V3 Structure]
-* link:https://github.com/ob1337/SNIPs/blob/snip-10/SNIPS/snip-10.md[SNIP 10: STRK fee token]
+== Roadmap and version updates
 
+You can subscribe to get the latest version updates delivered to your inbox at  link:https://www.starknet.io/en/roadmap[Starknet Roadmap & version updates].
 
+For information on the current version of Starknet, see the xref:version_notes.adoc[Starknet release notes].

components/Starknet/modules/starknet_versions/pages/version_notes.adoc

@@ -16,10 +16,27 @@ include::ROOT:partial$snippet_important_goerli2_removed.adoc[]
 |Environment |Starknet version|Sierra version|Cairo version
 
 |Mainnet|0.12.2|1.3.0|2.0.0 - 2.3.1
+
 |Sepolia Testnet|0.13.0|1.4.0|2.0.0 - 2.4.0
 |Goerli Testnet (deprecated)|0.13.0|1.4.0|2.0.0 - 2.4.0
 |===
 
+[id="version0.13.0"]
+== Starknet v0.13.0 (December 13th 23)
+
+Starknet v0.13.0 is live on testnet.
+
+Starknet 0.13.0 includes the following changes:
+
+* v3 transactions, including:
+** Fee payment in STRK
+** Reserved fields for future features, such as Volition and payment master
+* `get_block` API: The `gas_price` field is replaced by the `eth_l1_gas_price` and `strk_l1_gas_price` fields. This change applies also to existing blocks. For more information on the new fields, see the link:https://github.com/starkware-libs/starknet-specs/releases/tag/v0.6.0[JSON RPC API Spec on Github]
+* Sierra v1.4.0. This new version of Sierra is part of Crate v2.4.0, in the Cairo 2.4.0 package. For more information, see link:https://community.starknet.io/t/cairo-v2-4-0-is-out/109275[Cairo v2.4.0 is out!] on the Community forum.
+* Improved performance of `secp256k1_mul` and `secp256r1_mul` syscalls
+* Computation cost is reduced by approximately 200% as a result of reduced Cairo steps and increased use of builtins. L1 data availability cost is reduced by approximtately 10%.
+
+
 [id="version0.12.3"]
 == Starknet v0.12.3 (November 19th 23)