Fix sphinx documentation

[cortadocodes]

Contents

Fixes

• Fix links to documentation in README
• Remove generic content from README

Other fixes outside of the code

The main fixes to get the docs working were carried out in the admin interface of ReadTheDocs:

• Untick "Install project" in the advanced settings
• Set the default branch to main rather than master (since we've renamed our base branch)

I also stopped the building of epub and pdf docs as we're not using them.

Issues

• Close Update SDK readme and ensure that documentation gets served #70

[codecov-io]

Codecov Report

Merging #71 (c486b12) into release/0.1.8 (e63b88f) will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff               @@
##           release/0.1.8      #71   +/-   ##
==============================================
  Coverage          96.30%   96.30%           
==============================================
  Files                 40       40           
  Lines                839      839           
==============================================
  Hits                 808      808           
  Misses                31       31           

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