Bump golang.org/x/net from 0.17.0 to 0.23.0 (#95)

Bumps [golang.org/x/net](https://github.com/golang/net) from 0.17.0 to 0.23.0.
- [Commits](golang/net@v0.17.0...v0.23.0)

---
updated-dependencies:
- dependency-name: golang.org/x/net
  dependency-type: indirect
...

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server: add read only mode (#92)

In read only mode the endpoint to save new effects or add new versions
is deactivated. Also in the gallery the create button is deactivated and
there is a notice that says:

    The server is in maintenance mode. You can not create or modify effects.

The button to save effects in the editor is not deactivated as it will
take a bit more time and wanted to have the page up as soon as possible.

Bump golang.org/x/crypto from 0.14.0 to 0.17.0 (#90)

Bumps [golang.org/x/crypto](https://github.com/golang/crypto) from 0.14.0 to 0.17.0.
- [Commits](golang/crypto@v0.14.0...v0.17.0)

---
updated-dependencies:
- dependency-name: golang.org/x/crypto
  dependency-type: direct:production
...

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Bump golang.org/x/net from 0.7.0 to 0.17.0 (#89)

Bumps [golang.org/x/net](https://github.com/golang/net) from 0.7.0 to 0.17.0.
- [Commits](golang/net@v0.7.0...v0.17.0)

---
updated-dependencies:
- dependency-name: golang.org/x/net
  dependency-type: indirect
...

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goreleaser: updates to make it work with new version

* archives.replacements was deprecated in the configuration file https://goreleaser.com/deprecations/#archivesreplacements
* parameter `--rm-dist` is now `--clean`

Fixes #88

Dockerfile: upgrade base image so it uses a compatible glibc

Enable CORS header in `/item` (#87)

* go: upgrade go compiler to 1.21

Use crypto/rand instead of math/rand as it is now the recommended
method.

* server: add cors configuration to items

This lets other web pages use it as an external API.

* go.mod: upgrade go version and indirect dependencies

Fix build errors

Upgrade compiler and dependencies to fix security alerts

Upgrade go compiler to 1.19 (#84)

Version 1.16 was already unsupported and I believe is causing errors
generating binaries.