Adding vscode settings for this project

Also updating the table of content to use gitea slufigy mode.
Generating the table of content is made with the extension "Markdown
All in One". Unfortunately, it doesn't generate anchors fitting for gitea.
This TOC is generated with a modified version of Markdown All in One to
add a gitea slugification mode.

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "markdown.extension.toc.slugifyMode": "gitea"
+}

README.md

@@ -2,8 +2,8 @@
 
 My collection of dotfiles, to be used with `stow`
 
-- [:truck: How to get](#-how-to-get)
-- [:checkered_flag: How to use](#-how-to-use)
+- [:truck: How to get](#truck-how-to-get)
+- [:checkered_flag: How to use](#checkered-flag-how-to-use)
 
 ## :truck: How to get