Adding utils section and removing useless utils README.md file.

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diff --git a/docs/user_guide/utils/demonstrations_scripts.md b/docs/user_guide/utils/demonstrations_scripts.md
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+Demonstrations scripts
+======================
+
+Collection of command-line scripts for demonstration purpose.
+
+!!! note
+      *Consider that all inline commands below have to be executed at the root of ArGaze package folder.*
+
+!!! note
+      *Use -h option to get command arguments documentation.*
+
+## AR environment demonstration
+
+Load AR environment from **setup.json** file, detect ArUco markers into camera device (-d DEVICE) frames and estimate envirnoment pose.
+
+```shell
+python ./src/argaze/utils/demo_ar_features_run.py -d DEVICE
+```
+
+!!! warning
+      This demonstration assumes that camera calibration step is done and a **calibration.json** has been exported into *./src/argaze/utils/demo_environment/* folder.
+
+!!! note
+      Use **A3_demo.pdf** file located in *./src/argaze/utils/demo_environment/* folder ready to be printed on A3 paper sheet.
+
+## Gaze features demonstration
+
+Simulate gaze position using mouse pointer to illustrate gaze features.
+
+```shell
+python ./src/argaze/utils/demo_gaze_features_run.py
+```
+
+## Heatmap demonstration
+
+Simulate gaze position using mouse pointer to produce heatmap picture.
+A picture is saved by pressing escape key.
+
+```shell
+python ./src/argaze/utils/demo_heatmap_run.py
+```
diff --git a/docs/user_guide/utils/ready-made_scripts.md b/docs/user_guide/utils/ready-made_scripts.md
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+Ready-made scripts
+==================
+
+Collection of command-line scripts to provide useful features.
+
+!!! note
+      *Consider that all inline commands below have to be executed at the root of ArGaze package folder.*
+
+!!! note
+      *Use -h option to get command arguments documentation.*
+
+## ArUco Markers factory
+
+Export all markers from *DICT_APRILTAG_16h5* dictionary as 5 cm pictures with 300 dpi resolution into an *./src/argaze/utils/_export/markers* folder:
+
+```shell
+python ./src/argaze/utils/aruco_markers_dictionary_export.py DICT_APRILTAG_16h5 -s 5 -r 300 -o ./src/argaze/utils/_export/markers
+```
+
+Export a 7 columns and 5 rows calibration board made of 5cm squares with 3cm markers from *DICT_APRILTAG_16h5* dictionary at 300 dpi into an *./src/argaze/utils/_export* folder:
+
+```shell
+python ./src/argaze/utils/aruco_calibration_board_export.py 7 5 5 3 DICT_APRILTAG_16h5 -r 300 -o ./src/argaze/utils/_export
+```
+
+## Camera calibration
+
+Calibrate a camera device (-d DEVICE) using a 7 columns and 5 rows calibration board made of 5cm squares with 3cm markers from *DICT_APRILTAG_16h5* dictionary. Then, export its optical parameters into an *calibration.json* file into *./src/argaze/utils/demo_environment/* folder:
+
+```shell
+python ./src/argaze/utils/camera_calibrate.py 7 5 5 3 DICT_APRILTAG_16h5 -d DEVICE -o ./src/argaze/utils/demo_environment
+```
+
+!!! note
+      Use **A3_DICT_APRILTAG_16h5_3cm_35cmx25cm.pdf** file located in *./src/argaze/ArUcoMarkers/utils/* folder ready to be printed on A3 paper sheet.