🙌🏼 Remove outdated documentation files

Author: ZenanH

docs/make.jl

@@ -15,31 +15,19 @@ makedocs(
             "introduction/getstarted.md",
             "introduction/why.md",
             "introduction/ecosystem.md",
-            "introduction/tips.md",
         ],
-        # "Interface" => Any[
-        #     "interface/structs.md",
-        #     "interface/backendagnostic.md",
-        #     "interface/kernelfunctions.md",
-        #     "interface/mpmprocess.md",
-        #     "interface/workflow.md",
-        #     "interface/imexport.md",
-        # ],
-        # "Tutorials" => Any[
-        #     "tutorials/example1.md",
-        #     "tutorials/example2.md",
-        #     "tutorials/example3.md"
-        # ],
-        # "Advanced Topics" => Any[
-        #     "advancedtopics/customkernel.md",
-        #     "advancedtopics/customconstitutive.md",
-        #     "advancedtopics/custommpmprocess.md",
-        #     "advancedtopics/customextension.md",
-        #     "advancedtopics/customfriction.md"
-        # ],
-        # "Useful Tools" => Any[
-        #     "utils/debug.md",
-        # ]
+        "DataType System" => Any[
+            "datatype/backgroundgrid.md",
+        ],
+        "Advanced Topics" => Any[
+            "advancedtopics/plugin.md",
+        ],
+        "Examples" => Any[
+            "examples/example1.md",
+        ],
+        "Others" => Any[
+            "others/gpu.md",
+        ]
     ],
     warnonly = [:missing_docs, :cross_references],
 )

docs/src/advancedtopics/customconstitutive.md

@@ -0,0 +1,3 @@
+# Plugin System
+
+... todo

docs/src/advancedtopics/customextension.md

@@ -0,0 +1 @@
+# Backgroud Grid

docs/src/advancedtopics/customfriction.md

@@ -0,0 +1,60 @@
+# 2D Soil Collapse Test
+
+!!! note
+
+    1) We use a classic example: 2D & 3D granular collapse[^1], to demonstrate how to establish computational models and solve them. 
+    2) To successfully run the code, we will install the dependencies at the beginning of the code provided below. If you are already familiar with the Julia Pkg ENV and have installed the necessary packages, you can ignore this part.
+    3) We default to using Nvidia's GPU or x86/ARM CPUs. If you want to use other acceleration backends, please make modifications in the appropriate places in the code.
+    4) We use Unicode to enhance readability (when comparing formulas), but sometimes it may be confused with regular letters, such as ``\nu`` and `v`. If you are using VSCode, you can enable the following in the settings:
+    
+       ```json
+       "editor.unicodeHighlight.ambiguousCharacters": true,
+       ```
+
+    5) You can copy and save it in the `your_file.jl` and run the file directly using Julia in `REPL`:
+
+       ```julia-repl
+       julia> include("path/to/your_file.jl")
+       ```
+
+        Or run this file in the terminal:
+
+       ```bash
+       bash> julia path/to/your_file.jl
+       ```
+
+[^1]: Bui, H.H., Fukagawa, R., Sako, K., Ohno, S., 2008. Lagrangian meshfree particles method (SPH) for large deformation and failure flows of geomaterial using elastic–plastic soil constitutive model. Int. J. Numer. Anal. Methods Geomech. 32, 1537–1570. https://doi.org/10.1002/nag.688
+
+::: details Here is the complete 2D code
+
+```julia
+using Pkg
+Pkg.add(["MaterialPointSolver", "MaterialPointGenerator", "CairoMakie", "CUDA"])
+using MaterialPointSolver
+using MaterialPointGenerator
+using CairoMakie
+using CUDA
+```
+
+:::
+
+## 2D model description
+
+```@raw html
+<br>
+<img src="./figures/exp_model.png" width=50%>
+<br>
+```
+
+In this example, aluminum bars are used to model the non-cohesive soil collapse. We use uGIMP to simulate the failure process of soil collapse. The geometry of the numerical model is depicted in the figure, with a length ``l`` of ``0.2\ m`` and a height ``h`` of ``0.1\ m``. The parameters of the numerical model are provided in the Table.
+
+| Parameter   | Value            | Unit       | Description            |
+|:-----------:|:----------------:|:----------:|:----------------------:|
+| ``\rho``    | ``2650``         | ``kg/m^3`` | density                |
+| ``\mu``     | ``0.3``          | -          | Poisson's ratio        |
+| ``K``       | ``7\times 10^5`` | ``Pa``     | bulk modulus           |
+| ``t_{sim}`` | ``1.0``          | second     | simulation time        |
+| ``\phi``    | ``19.8``         | degree     | friction angle         |
+| ``\alpha``  | ``1.0``          |  -         | FLIP-PIC mixing factor |
+
+## 2D code explaination