Bump github.com/fatih/color from 1.10.0 to 1.13.0

Bumps [github.com/guregu/null](https://github.com/guregu/null) from 3.5.0+incompatible to 4.0.0+incompatible.
- [Release notes](https://github.com/guregu/null/releases)
- [Commits](https://github.com/guregu/null/compare/v3.5.0...v4.0.0)

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Bumps [github.com/fatih/color](https://github.com/fatih/color) from 1.10.0 to 1.13.0.
- [Release notes](https://github.com/fatih/color/releases)
- [Commits](https://github.com/fatih/color/compare/v1.10.0...v1.13.0)

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Bump github.com/gorilla/sessions from 1.2.0 to 1.2.1

Bump github.com/manifoldco/promptui from 0.8.0 to 0.9.0

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.7.0 to 1.8.1.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](https://github.com/stretchr/testify/compare/v1.7.0...v1.8.1)

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Bumps [github.com/gorilla/csrf](https://github.com/gorilla/csrf) from 1.7.0 to 1.7.1.
- [Release notes](https://github.com/gorilla/csrf/releases)
- [Commits](https://github.com/gorilla/csrf/compare/v1.7.0...v1.7.1)

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Bumps [github.com/manifoldco/promptui](https://github.com/manifoldco/promptui) from 0.8.0 to 0.9.0.
- [Release notes](https://github.com/manifoldco/promptui/releases)
- [Changelog](https://github.com/manifoldco/promptui/blob/master/CHANGELOG.md)
- [Commits](https://github.com/manifoldco/promptui/compare/v0.8.0...v0.9.0)

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From Go 1.15

This fixes PEM key decoding issues, and federation

Bump github.com/microcosm-cc/bluemonday from 1.0.5 to 1.0.21

A Bunch Tell is now Musing Studio.

Bumps [github.com/microcosm-cc/bluemonday](https://github.com/microcosm-cc/bluemonday) from 1.0.5 to 1.0.21.
- [Release notes](https://github.com/microcosm-cc/bluemonday/releases)
- [Commits](https://github.com/microcosm-cc/bluemonday/compare/v1.0.5...v1.0.21)

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Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 4.0.1 to 4.1.1.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](https://github.com/docker/metadata-action/compare/v4.0.1...v4.1.1)

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Bumps [docker/login-action](https://github.com/docker/login-action) from 2.0.0 to 2.1.0.
- [Release notes](https://github.com/docker/login-action/releases)
- [Commits](https://github.com/docker/login-action/compare/v2.0.0...v2.1.0)

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Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 3.0.0 to 3.2.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v3.0.0...v3.2.0)

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Bumps [github.com/gorilla/sessions](https://github.com/gorilla/sessions) from 1.2.0 to 1.2.1.
- [Release notes](https://github.com/gorilla/sessions/releases)
- [Commits](https://github.com/gorilla/sessions/compare/v1.2.0...v1.2.1)

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Create container from GitHub action

Update GH-actions

Enables listening on unix sockets by specifying a file path for the bind address

This fixes "unknown revision v1.66.4" error

This fixes build issues we're having due to the SSL certificate
on git.mills.io. It also updates to the latest version of the
go-gopher library.

Originally requested on the forum:
https://discuss.write.as/t/use-non-random-ids-for-untitled-posts-in-blog-stats/5046

Originally requested on the forum:
https://discuss.write.as/t/minimize-subject-of-email-updates/3881

We now detect whether a file is being dropped by a user (by checking `event.dataTransfer.files.length`) and prevent the remaining drop behavior if this is the case. Otherwise, drop happens like normal (so a user can still drop text into the editor, or even an image that has been uploaded already via normal means and rendered in the editor).

Will render if a file exists at: static/local/custom.css

Ref T563

#514 - Fix login with Gitea OAuth: external user ID not recorded

Fix monetization_pointer upsert query for SQLite

Ref T874 T744

Closes #522

Fixes #495

Fix date format in anonymous posts

Miscellaneous fixes

Elide Markdown when generating slug