Updated table of contents

Author: jmfernandez

README.md

@@ -8,19 +8,27 @@ A set of Python programs to monitor, collect, and digest metrics of a given Linu
 
 ## Table of Contents
 
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 - [`treecript`: Process Tree Metrics Transcriptor](#treecript-process-tree-metrics-transcriptor)
   - [Table of Contents](#table-of-contents)
   - [Repository Structure](#repository-structure)
   - [Installation](#installation)
-    - [Prerequisites](#prerequisites)
+    - [Prerequisites (singularity)](#prerequisites-singularity)
+    - [Prerequisites (native)](#prerequisites-native)
     - [Not sure which installation method to use?](#not-sure-which-installation-method-to-use)
-    - [Choosing a constraints file](#choosing-a-constraints-file)
-    - [Option 1: pip + virtual environment (venv)](#option-1-pip--virtual-environment-venv)
-    - [Option 2: Conda environment](#option-2-conda-environment)
+    - [Choosing a constraints file (only needed for option 2 or option 3)](#choosing-a-constraints-file-only-needed-for-option-2-or-option-3)
+    - [Option 1: Singularity](#option-1-singularity)
+      - [Alternative A: Fetch a pre-built image (only for metrics gathering)](#alternative-a-fetch-a-pre-built-image-only-for-metrics-gathering)
+      - [Alternative B: Building from source](#alternative-b-building-from-source)
+    - [Option 2: pip + virtual environment (venv)](#option-2-pip--virtual-environment-venv)
+    - [Option 3: Conda environment](#option-3-conda-environment)
       - [Installing Miniconda (if not already installed)](#installing-miniconda-if-not-already-installed)
       - [Creating the treecript conda environment](#creating-the-treecript-conda-environment)
     - [Verifying the installation](#verifying-the-installation)
-  - [Quick Start](#quick-start)
+  - [Quick Start (Singularity/Apptainer)](#quick-start-singularityapptainer)
+  - [Quick Start (other options)](#quick-start-other-options)
   - [Programs Reference](#programs-reference)
     - [Collecting metrics](#collecting-metrics)
     - [Plotting time series charts](#plotting-time-series-charts)
@@ -38,7 +46,8 @@ A set of Python programs to monitor, collect, and digest metrics of a given Linu
     - [`plotGraph.sh`](#plotgraphsh)
     - [`plot-metrics.sh`](#plot-metricssh)
   - [License](#license)
-
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 ## Repository Structure