docs: reorganize documentation structure and features list

- Reorder sidebar: Variable Substitution earlier, Tables.jl in API section
- Reorganize features list by category for better readability

Author: s-celles

docs/make.jl

@@ -20,8 +20,9 @@ makedocs(
         "Installation" => "install.md",
         "Quick Start" => "quickstart.md",
         "Variable Declaration" => "variables.md",
-        "Using with Pluto reactive notebooks" => "pluto.md",
         "Command discovery and help" => "command_discovery_help.md",
+        "Variable Substitution" => "substitute.md",
+        "Using with Pluto reactive notebooks" => "pluto.md",
         "Mathematics" => [
             "Algebra" => "mathematics/algebra.md",
             "Calculus" => "mathematics/calculus.md",
@@ -37,14 +38,13 @@ makedocs(
             "Discrete-Time Transforms" => "domains/signal/discrete_transforms.md",
             "Continuous-Time Transforms" => "domains/signal/continuous_transforms.md",
         ],
-        "Tables.jl Compatibility" => "tables.md",
-        "Variable Substitution" => "substitute.md",
         "API Reference" => [
             "Core API" => "api/core.md",
             "GIAC Commands" => "api/giac_commands.md",
             "Commands submodule" => "api/commands_submodule.md",
             "TempApi" => "api/tempapi.md",
         ],
+        "Tables.jl Compatibility" => "tables.md",
         "Extensions" => [
              "Symbolics.jl" => "extensions/symbolics.md",
         ],

docs/src/index.md

@@ -5,24 +5,24 @@ A Julia wrapper for the [GIAC](https://www-fourier.ujf-grenoble.fr/~parisse/giac
 ## Features
 
 - **Dynamic Command Invocation**: Access all 2200+ GIAC commands via `invoke_cmd(:cmd, args...)`
+- **Commands Submodule**: All ~2000+ commands available via `Giac.Commands` for clean namespace
 - **Expression Evaluation**: Parse and evaluate mathematical expressions
+- **Command Discovery**: Search commands, browse by category, built-in help via `?cmd`
 - **Arithmetic Operations**: +, -, *, /, ^, unary negation, equality
-- **Calculus**: Differentiation, integration, limits, and series expansion
 - **Algebra**: Factorization, expansion, simplification, equation solving and GCD
+- **Calculus**: Differentiation, integration, limits, and series expansion
+- **Infinity Support**: Use Julia's `Inf` and `-Inf` directly in limits and improper integrals
 - **Linear Algebra**: Symbolic matrices with determinant, inverse, trace, transpose operations
-- **Command Discovery**: Search commands, browse by category, built-in help via `?cmd`
-- **Commands Submodule**: All ~2000+ commands available via `Giac.Commands` for clean namespace
-- **TempApi Submodule**: Simplified function names (`diff`, `factor`, etc.) via `Giac.TempApi`
-- **Method Syntax**: Call commands as methods: `expr.factor()`, `expr.diff(x)`
 - **Base Extensions**: Use `sin(expr)`, `cos(expr)`, `exp(expr)` with GiacExpr
+- **Method Syntax**: Call commands as methods: `expr.factor()`, `expr.diff(x)`
+- **Variable Substitution**: Symbolics.jl-compatible `substitute(expr, Dict(var => value))` interface
+- **Laplace Transform**: `laplace` and `ilaplace` commands for continuous-time signal processing
+- **Z-Transform**: `ztrans` and `invztrans` commands for discrete-time signal processing
 - **Type Conversion**: Convert results to Julia native types (Int64, Float64, Rational)
-- **LaTeX Support**: Automatic LaTeX rendering in Pluto notebooks
 - **Symbolics.jl Integration**: Bidirectional conversion with Symbolics.jl
 - **Tables.jl Compatibility**: Convert GiacMatrix and command help to DataFrames, CSV export
-- **Variable Substitution**: Symbolics.jl-compatible `substitute(expr, Dict(var => value))` interface
-- **Infinity Support**: Use Julia's `Inf` and `-Inf` directly in limits and improper integrals
-- **Z-Transform**: `ztrans` and `invztrans` commands for discrete-time signal processing
-- **Laplace Transform**: `laplace` and `ilaplace` commands for continuous-time signal processing
+- **LaTeX Support**: Automatic LaTeX rendering in Pluto notebooks
+- **TempApi Submodule**: Simplified function names (`diff`, `factor`, etc.) via `Giac.TempApi`
 
 ## Installation