docs: added specVersion releases (#673)

* docs: added specVersion releases

* docs: specVersion description improved

website/pages/en/developing/creating-a-subgraph.mdx

@@ -146,6 +146,8 @@ dataSources:
 
 The important entries to update for the manifest are:
 
+- `specVersion`: a semver version that identifies the supported manifest structure and functionality for the subgraph. The latest version is `1.2.0`. See [specVersion releases](#specversion-releases) section to see more details on features & releases.
+
 - `description`: a human-readable description of what the subgraph is. This description is displayed in Graph Explorer when the subgraph is deployed to Subgraph Studio.
 
 - `repository`: the URL of the repository where the subgraph manifest can be found. This is also displayed in Graph Explorer.
@@ -186,6 +188,20 @@ These ordering rules are subject to change.
 
 > **Note:** When new [dynamic data source](#data-source-templates-for-dynamically-created-contracts) are created, the handlers defined for dynamic data sources will only start processing after all existing data source handlers are processed, and will repeat in the same sequence whenever triggered.
 
+### SpecVersion Releases
+
+| Version | Release notes |
+| :-: | --- |
+| 1.2.0 | Added support for [Indexed Argument Filtering](/#indexed-argument-filters--topic-filters) & declared `eth_call` |
+| 1.1.0 | Supports [Timeseries & Aggregations](#timeseries-and-aggregations). Added support for type `Int8` for `id`. |
+| 1.0.0 | Supports [`indexerHints`](/developing/creating-a-subgraph/#indexer-hints) feature to prune subgraphs |
+| 0.0.9 | Supports `endBlock` feature |
+| 0.0.8 | Added support for polling [Block Handlers](developing/creating-a-subgraph/#polling-filter) and [Initialisation Handlers](developing/creating-a-subgraph/#once-filter). |
+| 0.0.7 | Added support for [File Data Sources](developing/creating-a-subgraph/#file-data-sources). |
+| 0.0.6 | Supports fast [Proof of Indexing](/network/indexing/#what-is-a-proof-of-indexing-poi) calculation variant. |
+| 0.0.5 | Added support for event handlers having access to transaction receipts. |
+| 0.0.4 | Added support for managing subgraph features. |
+
 ### Getting The ABIs
 
 The ABI file(s) must match your contract(s). There are a few ways to obtain ABI files:

website/route-lockfile.txt

@@ -58,6 +58,8 @@
 /ar/substreams/
 /ar/sunrise/
 /ar/tokenomics/
+/cs/
+/cs/404/
 /cs/about/
 /cs/arbitrum/arbitrum-faq/
 /cs/arbitrum/l2-transfer-tools-faq/
@@ -302,6 +304,8 @@
 /es/substreams/
 /es/sunrise/
 /es/tokenomics/
+/fr/
+/fr/404/
 /fr/about/
 /fr/arbitrum/arbitrum-faq/
 /fr/arbitrum/l2-transfer-tools-faq/
@@ -475,6 +479,8 @@
 /hi/substreams/
 /hi/sunrise/
 /hi/tokenomics/
+/it/
+/it/404/
 /it/about/
 /it/arbitrum/arbitrum-faq/
 /it/arbitrum/l2-transfer-tools-faq/