fix ToC spacing

README.md

@@ -7,13 +7,11 @@ This guide targets the broader technical audience willing to understand in depth
 ## Table of Contents
 
 ### Distributed Computing Concepts
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 * [Paradigms of Distributed Computing](distributed-computing-concepts/paradigms-of-distributed-computing.md)
 * [Client-side Validation](distributed-computing-concepts/client-side-validation.md)
 * [Single-use Seals and Proof of Publication](distributed-computing-concepts/single-use-seals.md)
 
 ### Commitment Layer
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 * [Commitment Schemes within Bitcoin and RGB](commitment-layer/commitment-schemes.md)
 * [Deterministic Bitcoin Commitments - DBC](commitment-layer/deterministic-bitcoin-commitments-dbc/)
   * [Opret](commitment-layer/deterministic-bitcoin-commitments-dbc/opret.md)
@@ -22,14 +20,12 @@ This guide targets the broader technical audience willing to understand in depth
 * [Anchors](commitment-layer/anchors.md)
 
 ### RGB State and Operations
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 * [Introduction to Smart Contracts and their States](rgb-state-and-operations/intro-smart-contract-states.md)
 * [Contract Operations](rgb-state-and-operations/state-transitions.md)
 * [Components of a Contract Operation](rgb-state-and-operations/components-of-a-contract-operation.md)
 * [Features of RGB State](rgb-state-and-operations/features-of-rgb-state.md)
 
 ### RGB Contract Implementation
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 * [Contract Implementation in RGB](rgb-contract-implementation/schema-interface.md)
 * [Schema](rgb-contract-implementation/schema/)
   * [Schema example: Non-Inflatable Assets](rgb-contract-implementation/schema/non-inflatable-fungible-asset-schema.md)
@@ -39,11 +35,9 @@ This guide targets the broader technical audience willing to understand in depth
 * [Interface Implementation](rgb-contract-implementation/interface-implementation.md)
 
 ### RGB over Lightning Network
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 * [Lightning Network compatibility](rgb-over-lightning-network/lightning-network-compatibility.md)
 
 ### Annexes
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 * [Glossary](annexes/glossary.md)
 * [Contract Transfers](annexes/contract-transfers.md)
 * [Invoices](annexes/invoices.md)