refactor: use TOML for configuration file (#1228)

* refactor: remove jsconfig.json

* chore: remove devcontainer config

* refactor: migrate Hugo configuration from `hugo.yaml` to dedicated `module.toml` and `params.toml` files, and update minimum Hugo version.

* refactor: migrate demo site configuration from `hugo.yaml` to `config/_default/*.toml`

* feat: enable local sidebar avatar for demo site and relocate its image to demo assets.

* feat: migrate demo site to Hugo Modules for theme management.

* fix: wrong config folder name

assets/jsconfig.json

@@ -1,12 +0,0 @@
-{
-    "compilerOptions": {
-        "baseUrl": ".",
-        "paths": {
-            "*": [
-                "*"
-            ]
-        },
-        "lib": ["es2020", "dom"],
-        "jsx": "preserve"
-    }
-}