Fix readme tutorial link

[IAlibay]

I noticed the README.rst link for tutorials was broken.

Turns out that combining bold + reference is a non-trivial thing: https://docutils.sourceforge.io/FAQ.html#is-nested-inline-markup-possible.

It didn't seem immediately clear to me that bolding the tutorials link was necessary, so I just removed it. If we want to keep it I'll add in a substitution definition.

Changes made in this Pull Request:

• Fix the link for tutorials in README.rst

PR Checklist

• Tests? N/A
• Docs? N/A
• CHANGELOG updated? N/A
• Issue raised/referenced? N/A

[codecov]

Codecov Report

Merging #2961 into develop will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2961      +/-   ##
===========================================
- Coverage    93.05%   93.03%   -0.02%     
===========================================
  Files          186      186              
  Lines        24609    24607       -2     
  Branches      3187     3181       -6     
===========================================
- Hits         22900    22894       -6     
- Misses        1661     1665       +4     
  Partials        48       48              

Impacted Files	Coverage Δ
coordinates/base.py	94.63% <0.00%> (-0.50%)	⬇️
util.py	89.45% <0.00%> (-0.02%)	⬇️

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[orbeckst]

Thank you!