Switch the project from 0xacab to github

While the folks running 0xacab are much more lovely than the github ones, this
project has outgrown the former:

- Github offers beefy continuous integration, make it easier to run the
  testsuite on every python version, instead of using a weird docker-based
  contraption. Moreover, I'd rather burn some Microsoft money than 0xacab one.
- Opening an account on 0xacab is non-trivial (by design), making it tedious
  for people to report issues and contribute to mat2.
- Gitlab is becoming unbearably slow and convoluted, even compared to Github's
  awful Copilot/AI push.

It's a sad state of affairs, but it's a pragmatic decision. People who don't
have a Github account can still report issues and send patches by sending me an
email.

1 files changed, 4 insertions, 4 deletions

diff --git a/doc/comparison_to_others.md b/doc/comparison_to_others.md
index 8939009..02648bd 100644
--- a/doc/comparison_to_others.md
+++ b/doc/comparison_to_others.md
@@ -19,14 +19,14 @@ details.
 # jpegoptim, optipng, …
 
 While designed to reduce as much as possible the size of pictures,
-those software can be used to remove metadata. They usually have very good
+those software can be used to remove metadata. They usually have excellent
 support for a single picture format, and can be used in place of mat2 for them.
 
 
 # PDF Redact Tools
 
 [PDF Redact Tools](https://github.com/firstlookmedia/pdf-redact-tools) is
-a software developed by the people from [First Look
+software developed by the people from [First Look
 Media](https://firstlook.media/), the entity behind, amongst other things, 
 [The Intercept](https://theintercept.com/).
 
@@ -34,13 +34,13 @@ The tool uses roughly the same approach than mat2 to deal with PDF,
 which is unfortunately the only fileformat that it does support.
 It's interesting to note that it has counter-measures against
 [yellow dots](https://en.wikipedia.org/wiki/Machine_Identification_Code),
-a capacity that mat2 [doesn't possess yet](https://0xacab.org/jvoisin/mat2/issues/43).
+a capacity that mat2 doesn't have.
 
 
 # Exiv2
 
 [Exiv2](https://www.exiv2.org/) was considered for mat2,
-but it currently [misses a lot of metadata](https://0xacab.org/jvoisin/mat2/issues/85)
+but it currently misses a lot of metadata.
 
 
 # Others non open source software/online service