Use HTTPS repository link for devcontainer (#837)

* Use HTTPS repository link for devcontainer

The SSH repository link means you need to be set up with a key, have already accepted the github.com host key.

Cloning via HTTPS requires less steps.

* Update devcontainer.json

* Update requirements.txt

.devcontainer/devcontainer.json

@@ -2,7 +2,7 @@
 // README at: https://github.com/devcontainers/templates/tree/main/src/python
 {
 	"name": "Python 3",
-	"image": "mcr.microsoft.com/devcontainers/python:0-3.10",
+	"image": "mcr.microsoft.com/devcontainers/python:3.11",
 	"features": {
 		"ghcr.io/devcontainers/features/node:1": {}
 	},

README.md

@@ -117,7 +117,7 @@ make format
 
 ### DevContainers
 
-This repository also supports DevContainers: [![Open in Remote - Containers](https://img.shields.io/static/v1?label=Remote%20-%20Containers&message=Open&color=blue&logo=visualstudiocode)](https://vscode.dev/redirect?url=vscode://ms-vscode-remote.remote-containers/cloneInVolume?url=git@github.com:sissbruecker/linkding.git)
+This repository also supports DevContainers: [![Open in Remote - Containers](https://img.shields.io/static/v1?label=Remote%20-%20Containers&message=Open&color=blue&logo=visualstudiocode)](https://vscode.dev/redirect?url=vscode://ms-vscode-remote.remote-containers/cloneInVolume?url=https://github.com/sissbruecker/linkding.git)
 
 Once checked out, only the following commands are required to get started: