refactor: update latex source hierarchy

Collect the latex source files in a src directory and update the
corresponding GitHub actions workflow.

.github/workflows/release.yml

@@ -13,9 +13,12 @@ jobs:
       - name: Compile LaTeX Document
         uses: xu-cheng/latex-action@v2
         with:
-          root_file: main.tex
+          work_in_root_file_dir: true
+          root_file: |
+            src/main.tex
       - name: Release
         uses: softprops/action-gh-release@v1
         with:
           generate_release_notes: true
-          files: main.pdf
+          files: |
+            src/main.pdf

README.md

@@ -9,7 +9,6 @@
 
 Template for writing CI enabled LaTeX documents. According to the version number provided with a [git-tag](https://git-scm.com/book/en/v2/Git-Basics-Tagging), state of the LaTeX project and its PDF output are saved as release assets.
 
-
 ## Usage
 
 Make changes to the LaTeX documents, and provide [git-tags](https://git-scm.com/book/en/v2/Git-Basics-Tagging) to the commits where you see fit, with annotations regarding the version as in the form of `v*` (e.g. v1.0.2). A PDF file will automatically be generated from the tags. In the wake of PDF generation, it will be used as an additional asset for the automatic release based on the provided tag. This template is written in a self-evident manner, hence for demonstration, checkout the [Releases](https://github.com/tunakasif/latex-ci-template/releases) page.
@@ -28,11 +27,12 @@ The sample LaTeX document hierarchy is in the form below. It is a minimal demons
 
 ```stdout
 .
-├── bibliography.bib
-├── images
-│   └── space.jpg
-├── main.tex
-├── my_table.tex
+└── src
+    ├── images
+    │   └── space.jpg
+    ├── bibliography.bib
+    ├── main.tex
+    └── my_table.tex
 ```
 
 As expected, building process depends on the document hierarchy. This template is designed for the base case provided in [xu-cheng/latex-action@v2](https://github.com/xu-cheng/latex-action) such that we have a single `root_file: main.tex`, and we are compiling with default settings of [xu-cheng/latex-action@v2](https://github.com/xu-cheng/latex-action). The provided hierarchy can be changed easily, however [`release.yml`](./.github/workflows/release.yml) needs to be changed, accordingly. Since [xu-cheng/latex-action@v2](https://github.com/xu-cheng/latex-action) provides a rich documentation, this aspect should not be problematic.