Add devcontainer, linters and update packages

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config
+// options, see the README at:
+// https://github.com/devcontainers/templates/tree/main/src/typescript-node
+{
+	// A name for the dev container displayed in the UI.
+	"name": "dev-relax-api",
+
+	"image": "mcr.microsoft.com/devcontainers/typescript-node:1-20",
+	// Or use a Dockerfile or Docker Compose file. More info:
+	// https://containers.dev/guide/dockerfile
+	// "build": {
+	//   // Sets the run context to the same level of the .devcontainer folder.
+	//   "context": ".",
+	//   // Update the 'dockerFile' property if you aren't using the standard
+	//   // 'Dockerfile' filename.
+	//   "dockerfile": "Dockerfile"
+	// },
+	// "dockerComposeFile": "docker-compose.yml",
+	// "service": "devcontainer",
+
+	// An array of Docker CLI arguments that should be used when running the
+	// container.
+	"runArgs": ["--name=dev-relax", "--rm", "-p", "8080:8080", "-p", "3000:3000", "--network=host"],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "bash .devcontainer/install_dependencies.sh && export PUPPETEER_EXECUTABLE_PATH=/usr/bin/chromium && yarn install && yarn serve",
+
+	// Indicates whether devcontainer.json supporting tools should stop the
+	// containers when the related tool window is closed / shut down.
+	"shutdownAction": "stopContainer",
+	// "shutdownAction": "stopCompose",
+
+	// Sets the default path that devcontainer.json supporting services / tools
+	// should open when connecting to the container. Defaults to the automatic
+	// source code mount location.
+	"workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+
+	// Features to add to the dev container.
+	// More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container
+	// available locally.
+	// "forwardPorts": [],
+
+	// Configure tool-specific properties.
+	"customizations": {
+		// Configure properties specific to VS Code.
+		"vscode": {
+			"settings": {},
+			"extensions": [
+				"esbenp.prettier-vscode",
+				"foxundermoon.shell-format",
+				"davidanson.vscode-markdownlint",
+				"fnando.linter",
+				"streetsidesoftware.code-spell-checker"
+			]
+		}
+	},
+
+	// Comment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	"remoteUser": "root",
+	"features": {
+		"ghcr.io/akhildevelops/devcontainer-features/apt:0": {},
+		"ghcr.io/devcontainers/features/git:1": {
+			"ppa": true,
+			"version": "os-provided"
+		}
+	}
+}

.devcontainer/install_dependencies.sh

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+#! /bin/sh
+#========================================================================
+# Copyright Universidade Federal do Espirito Santo (Ufes)
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+# This program is released under license GNU GPL v3+ license.
+#
+#========================================================================
+
+# Clone RelaX repo* and checkout the static files (branch gh-pages)
+rm -rf dist && \
+mkdir dist && \
+cd dist && \
+git clone https://github.com/rlaiola/relax.git && \
+cd relax && \
+git config --global --add safe.directory . && \
+git checkout origin/gh-pages && \
+git checkout gh-pages && \
+git branch && \
+cd ../..
+
+# Install dependencies (chromium)
+apt-get update \
+&& apt-get install -y --no-install-recommends \
+    chromium \
+&& apt-get clean \
+&& rm -rf /var/lib/apt/lists/*
+
+# Set environment variables
+export NODE_OPTIONS=--openssl-legacy-provider

.markdownlint-cli2.jsonc

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+/*
+ * An example .markdownlint-cli2.jsonc file
+ */
+ {
+    // Disable some built-in rules
+    // "config": {
+    //   "no-trailing-spaces": false,
+    //   "no-multiple-blanks": false
+    // },
+
+    // Include a custom rule package
+    // "customRules": [
+    //   "markdownlint-rule-titlecase"
+    // ],
+
+    // Fix any fixable errors
+    // "fix": true,
+
+    // Define a custom front matter pattern
+    // "frontMatter": "<head>[^]*<\/head>",
+
+    // Ignore files referenced by .gitignore (only valid at root)
+    // "gitignore": true,
+
+    // Define glob expressions to use (only valid at root)
+    // "globs": [
+    //   "!*bout.md"
+    // ],
+
+    // Define glob expressions to ignore
+    "ignores": [".gitignore", "LICENSE"]
+
+    // Use a plugin to recognize math
+    // "markdownItPlugins": [
+    //   [ "@iktakahiro/markdown-it-katex" ]
+    // ],
+
+    // Additional paths to resolve module locations from
+    // "modulePaths": [
+    //   "./modules"
+    // ],
+
+    // Disable banner message on stdout (only valid at root)
+    // "noBanner": true,
+
+    // Disable inline config comments
+    // "noInlineConfig": true,
+
+    // Disable progress on stdout (only valid at root)
+    // "noProgress": true,
+
+    // Use a specific formatter (only valid at root)
+    // "outputFormatters": [
+    //   [ "markdownlint-cli2-formatter-default" ]
+    // ],
+
+    // Show found files on stdout (only valid at root)
+    // "showFound": true
+  }
+