Update Tutorial names

After #103 the tutorial title comes in the side bar in the website,
its better to have shorter names.

Author: rajarshimaitra

docs/tutorials/Bitcoin_Core_RPC_Demo.md

@@ -1,5 +1,5 @@
 ---
-title: "Using BDK to build a wallet backed by a Bitcoin Core full node"
+title: "BDK wallet with Bitcoin core RPC "
 description: "Tutorial showing usage of Bitcoin core backend with BDK wallet"
 authors:
     - Rajarshi Maitra

docs/tutorials/compact_filters_demo.md

@@ -1,5 +1,5 @@
 ---
-title: "Using BDK to create BIP157 SPV wallet (aka Neutrino)"
+title: "BDK wallet as a BIP157 SPV light client"
 description: "Tutorial showing usage of compact filters (BIP157) using bdk-cli command line tools"
 authors:
     - Rajarshi Maitra

docs/tutorials/descriptors_in_the_wild.md

@@ -1,5 +1,5 @@
 ---
-title: "Descriptors in the wild"
+title: "A Multisig between BDK and Core"
 description: "Guide to setup a 2-of-2 multisig using Bitcoin Core and BDK"
 authors:
     - Gabriele Domenichini

docs/tutorials/hidden-power-of-bitcoin.md

@@ -1,5 +1,5 @@
 ---
-title: "Miniscript Policy & Descriptors - Hidden Powers of Bitcoin"
+title: "Hidden Powers of Miniscript Policy & Descriptors"
 description: "Introduction to Descriptor and Miniscript, making a Multisig Wallet and Testing Miniscript Policies"
 authors:
     - Sandipan Dey

docs/tutorials/spending_policy_demo.md

@@ -1,5 +1,5 @@
 ---
-title: "Spending Policy Demo"
+title: "Spending Policy Decoded"
 description: "Demonstrate how to use a descriptor wallet with different spending policies"
 authors:
     - Steve Myers