Mass-replace blurb with seo:description in frontmatter

content/introduction/crypto-wallets.md

@@ -1,7 +1,8 @@
 ---
 html: crypto-wallets.html
 parent: intro-to-xrpl.html
-blurb: Wallets provide a convenient way of managing your XRP on the XRP Ledger.
+seo:
+    description: Wallets provide a convenient way of managing your XRP on the XRP Ledger.
 labels:
   - Blockchain
 ---

content/introduction/software-ecosystem.md

@@ -1,7 +1,8 @@
 ---
 html: software-ecosystem.html
 parent: introduction.html
-blurb: Get an overview of what XRP Ledger software is out there and how it fits together.
+seo:
+    description: Get an overview of what XRP Ledger software is out there and how it fits together.
 labels:
   - Core Server
 ---

content/introduction/transactions-and-requests.md

@@ -1,7 +1,8 @@
 ---
 html: txn-and-requests.html
 parent: intro-to-xrpl.html
-blurb: All interactions with the ledger are either transactions or requests.
+seo:
+    description: All interactions with the ledger are either transactions or requests.
 labels:
   - Blockchain
 ---

content/introduction/what-is-the-xrp-ledger.md

@@ -1,7 +1,8 @@
 ---
 html: what-is-the-xrp-ledger.html
 parent: introduction.html
-blurb: Learn about the XRP Ledger (XRPL) blockchain.
+seo:
+    description: Learn about the XRP Ledger (XRPL) blockchain.
 labels:
   - Blockchain
 ---

content/introduction/what-is-xrp.md

@@ -1,7 +1,8 @@
 ---
 html: what-is-xrp.html
 parent: introduction.html
-blurb: Learn about XRP, the cryptocurrency traded on the XRP Ledger.
+seo:
+    description: Learn about XRP, the cryptocurrency traded on the XRP Ledger.
 labels:
   - Blockchain
 ---