Functional bugfixes

[fpavogt]

Description:

This PR corrects some typos in MANIFEST.in that led to some configuration files not to be included in the wheels on PyPI. It also forces the utf-8 encoding when reading config files (to avoid problems on Windows).

This PR also sets some upper-limits to the supported package and python versions (Python 3.10 or 3.11, numpy<2.0, pandas <2.2), and adds missing links/info to the docs.

None of these changes alter the scientific behavior of dvas in any way.

Error(s) fixed:

Fixes #298.
Fixes #299.

Checklists:

• New code includes dedicated tests.
• New code has been linted.
• New code follows the project's style.
• New code is compatible with a GPL v3 license.
• CHANGELOG has been updated.
• AUTHORS has been updated.

[fpavogt]

@modolol: ready for your review, whenever you have a minute.
@GonzagueRomanens: fyi, if you maybe have the time to review this as well ?