Refactor styles to use logical properties for positioning (#23944)

app/javascript/styles/mastodon/about.scss

app/javascript/styles/mastodon/accounts.scss

app/javascript/styles/mastodon/admin.scss

app/javascript/styles/mastodon/basics.scss

app/javascript/styles/mastodon/components.scss

app/javascript/styles/mastodon/containers.scss

app/javascript/styles/mastodon/emoji_picker.scss

app/javascript/styles/mastodon/forms.scss

app/javascript/styles/mastodon/modal.scss

app/javascript/styles/mastodon/polls.scss

app/javascript/styles/mastodon/rich_text.scss

app/javascript/styles/mastodon/rtl.scss

app/javascript/styles/mastodon/statuses.scss

app/javascript/styles/mastodon/tables.scss

app/javascript/styles/mastodon/widgets.scss