[gimp-web] README: bit saner dependency handling.

[Jehan <jehanp src gnome org>]

commit e73ad82fd2122716714fd8a5a7cefee58cbf5c9a
Author: Jehan <jehan girinstud io>
Date:   Tue Feb 22 19:22:04 2022 +0100

    README: bit saner dependency handling.
    
    I'm wondering if even listing this snapshot of "known dependency
    versions to work" is fine. We should probably just wipe it out, because
    our website should work with latest versions and not be stuck in time.

 README.md | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)
---
diff --git a/README.md b/README.md
index f9291fa7..f3e77a07 100644
--- a/README.md
+++ b/README.md
@@ -36,13 +36,15 @@ Further information in greater detail can be found in the Pelican documentation
 
 #### Working versions
 
-The site builds locally with these versions:
-
-```
-$ python --version
-Python 3.5.7
-```
+The site should build locally with a recent version of Python 3. It has
+been reported to build with Python 3.5.7 and more recent versions such
+as Python 3.9.2 or 3.9.7, though ideally citing accurate Python version
+should not be needed. We expect this to work with any sufficiently
+modern Python 3.
 
+As for dependencies, below is a snapshot at a point in time. Yet, same
+as the Python version, the website has been known to build fine with
+newer dependency versions too.
 
 ```
 beautifulsoup4==4.7.1
@@ -65,11 +67,6 @@ typogrify==2.0.7
 Unidecode==1.1.1
 ```
 
-*Note: these are a snapshot at a point in time. The website has been
-known to build fine with newer versions too. For instance, as of
-2021-10-01, using Python 3.9.7 and recent versions of most dependencies
-worked fine too.*
-
 
 #### Windows Environment Variables
 
@@ -125,7 +122,7 @@ If you are writing content or developing the site, there is an option to have pe
 Python has a built-in simple web server that can be used to serve the site.
 From the `output/` directory:
 
-`python -m http.server`
+`python3 -m http.server`
 
 The site can then be accessed locally at `localhost:8000`.