[web] WIP notification management; add notification management to list of mytokens

internal/server/handlers.go

internal/server/web/partials/list-mts.mustache

...er/web/partials/notifications/email-not-provided.mustache

...er/web/partials/notifications/email-not-verified.mustache

...eb/partials/notifications/info-content-calendars.mustache

...artials/notifications/info-content-notifications.mustache

...l/server/web/partials/notifications/info-content.mustache

.../web/partials/notifications/info-subscribe-modal.mustache

...er/web/partials/notifications/subscribe-calendar.mustache

...ver/web/partials/notifications/subscribe-content.mustache

...eb/partials/notifications/subscribe-notification.mustache

internal/server/web/static/js/notifications.js

internal/server/web/static/js/tokeninfo-status.js

internal/server/web/static/js/tokeninfo.js

internal/server/web/static/js/utils.js

internal/utils/templating/keys.go