Add extension recommendations, fix linting warnings, improve accessibility (#378)

* chore: add VS Code extension recommendations

* Update image URLs in README and documentation files

* chore: disable no-inline-html rule

* chore: use standard md/mdx syntax, and use .jsx for react components

* chore: fix email links in Code of Conduct

The commit message suggests fixing the email links in the Code of Conduct file to use the correct `mailto:` syntax.

* chore: update actix-web error helper links

Update the links to the `actix-web` error helper traits in the `databases.md` and `errors.md` files to use the correct URLs.

* chore: restore unused actix-web error helper links

* Update src/pages/community/coc.md

Co-authored-by: Rob Ede <robjtede@icloud.com>

* Update docs/getting-started.md

Co-authored-by: Rob Ede <robjtede@icloud.com>

---------

Co-authored-by: Rob Ede <robjtede@icloud.com>

.vscode/extensions.json

@@ -0,0 +1,7 @@
+{
+  "recommendations": [
+    "esbenp.prettier-vscode",
+    "davidanson.vscode-markdownlint",
+    "unifiedjs.vscode-mdx"
+  ]
+}

.vscode/settings.json

@@ -1,9 +1,9 @@
 {
-    "cSpell.words": [
-        "actix",
-        "deserialization",
-        "rustls",
-        "serde",
-        "struct"
-    ]
+  "cSpell.words": ["actix", "deserialization", "rustls", "serde", "struct"],
+  "markdownlint.config": {
+    "no-inline-html": false,
+    "link-image-reference-definitions": false,
+    "commands-show-output": false,
+    "fenced-code-language": false
+  }
 }