Create editor screen and inline scripts and styles

src/main.rs

src/pages/get_about.rs

src/pages/get_contest_problem_by_id_label.rs

src/pages/get_editor.rs

src/pages/get_problems.rs

src/pages/get_submission.rs

src/pages/mod.rs

static/flatpickr.min.css

static/flatpickr.min.js

static/htmx.min.js

static/vs/base/common/worker/simpleWorker.nls.js

static/vs/base/worker/workerMain.js

static/vs/basic-languages/cpp/cpp.js

static/vs/editor.main.css

static/vs/editor/editor.main.js

static/vs/editor/editor.main.nls.js

static/vs/loader.js

templates/base.hbs

templates/contest_problem.hbs

templates/editor.hbs