Improve README and developer experience (Heroic-Games-Launcher#1807)

* Update VSCode configuration

* Lots of README changes

- Update our bages; might've overdone it a little, but they're fun to add :^)
- Add badges for Web Technologies used
- Rewrite & bump up system requirements a bit
- Wrap the Language list, Development in a container, and Screenshots in
  <details>; this makes the page load faster and makes it seem less
  daunting
- Add a Flathub badge to the Flatpak section
- Unify Linux install instructions (as much as possible)
- Remove 3rd-party APT repository
  In my opinion, we have enough distribution formats already, and the
  install instructions are a little dodgy
- Add Beta AUR package to the list
- Clarify Windows install instructions by splitting up WinGet and manual
  install
- Make "Development environment" its own section
- Remove Beta and Alpha notes on Windows and macOS build instructions
- Explain what exactly is happening when you run `yarn dev` and in which
  scenarios you might want to use it
- Move the "Back to top" badge to the actual bottom of the page

* Add a Content Security Policy

This doesn't really do much in our situation:
- Just in case someone ever manages to load a website in Heroic's main
  window, no JS can run inside it
- Gets rid of the warning in the console when testing with `yarn dev`

I've tested the Webviews (unaffected) and links to ProtonDB and such
(also unaffected, not sure why though). Please test if this breaks
anything

.vscode/launch.json

@@ -2,26 +2,14 @@
   "version": "0.2.0",
   "configurations": [
     {
-      "command": "yarn react-start",
-      "name": "Start renderer process",
-      "request": "launch",
-      "type": "node-terminal"
-    },
-    {
-      "name": "Debug Main Process",
-      "type": "pwa-node",
+      "name": "Launch Heroic (HMR & HR)",
+      "type": "node",
       "request": "launch",
       "cwd": "${workspaceFolder}",
-      "runtimeExecutable": "${workspaceFolder}/node_modules/.bin/electron",
+      "runtimeExecutable": "${workspaceRoot}/node_modules/.bin/vite",
       "windows": {
-        "runtimeExecutable": "${workspaceFolder}/node_modules/.bin/electron.cmd"
-      },
-      "resolveSourceMapLocations": [
-        "${workspaceFolder}/**",
-        "!**/node_modules/**"
-      ],
-      "args": ["."],
-      "outputCapture": "std"
+        "runtimeExecutable": "${workspaceRoot}/node_modules/.bin/vite.cmd"
+      }
     }
   ]
 }

.vscode/tasks.json

@@ -2,40 +2,42 @@
   "version": "2.0.0",
   "tasks": [
     {
-      "type": "npm",
-      "script": "dist",
-      "problemMatcher": [],
-      "label": "Test",
+      "type": "shell",
+      "label": "Run tests",
+      "command": "yarn test",
       "detail": "yarn test",
-      "group": {
-        "kind": "test",
-        "isDefault": true
-      }
+      "group": "test"
     },
     {
-      "type": "npm",
-      "script": "dist",
-      "problemMatcher": [],
+      "type": "shell",
       "label": "Build for Linux",
-      "detail": "yarn build-electron && yarn build && electron-builder -c.extraMetadata.main=build/main.js --linux",
+      "command": "yarn dist:linux",
+      "detail": "yarn dist:linux",
       "group": {
         "kind": "build",
         "isDefault": true
       }
     },
     {
-      "type": "npm",
-      "script": "dist",
-      "problemMatcher": [],
+      "type": "shell",
       "label": "Build for Windows",
-      "detail": "yarn build-electron && yarn build && electron-builder -c.extraMetadata.main=build/main.js --win"
+      "command": "yarn dist:win",
+      "detail": "yarn dist:win",
+      "group": "build"
     },
     {
-      "type": "npm",
-      "script": "dist",
-      "problemMatcher": [],
+      "type": "shell",
       "label": "Build for MacOS",
-      "detail": "yarn build-electron && yarn build && electron-builder -c.extraMetadata.main=build/main.js --darwin"
+      "command": "yarn dist:mac",
+      "detail": "yarn dist:mac",
+      "group": "build"
+    },
+    {
+      "type": "shell",
+      "label": "Check code for errors",
+      "command": "yarn codecheck",
+      "detail": "yarn codecheck",
+      "group": "test"
     }
   ]
 }