build: move docker to top-level directory

.devcontainer/devcontainer.json

@@ -3,7 +3,7 @@
 {
   "name": "Dev Environment",
   "build": {
-    "dockerfile": "Dockerfile"
+    "dockerfile": "../Dockerfile"
   },
   "customizations": {
     "vscode": {

.devcontainer/requirements.txt

@@ -1,21 +0,0 @@
-asttokens==2.2.1
-backcall==0.2.0
-decorator==5.1.1
-executing==1.2.0
-ipython==8.14.0
-jedi==0.19.0
-markdown-it-py==3.0.0
-matplotlib-inline==0.1.6
-mdurl==0.1.2
-parso==0.8.3
-pexpect==4.8.0
-pickleshare==0.7.5
-prompt-toolkit==3.0.39
-ptyprocess==0.7.0
-pure-eval==0.2.2
-Pygments==2.16.1
-rich==13.5.2
-six==1.16.0
-stack-data==0.6.2
-traitlets==5.9.0
-wcwidth==0.2.6