Fixes Needed for sphinxcontrib-tomyst

[mmcky]

• copy of _static folder is not present in _build/myst. It will also need to be put in the source location rather than the _build location.
• contents directive not being parsed correctly (See missing content directive  #3) [fixed by this PR]

[mmcky]

@AakashGfude can you work on a fix for the missing _static folder given your familiar with the builder elements. It needs to mirror the source location.

@mmcky to work on fixing contents directive

[AakashGfude]

sure @mmcky . On it

[AakashGfude]

@mmcky at present, the copy of static files to _build/myst/source is implemented by tomyst_static_file_path which has default value of ['_static']. For our lecture-python-programming and probably also for other repos, the value required is ["source/_static"], which when inputting to conf.py results in the copying of the _static files.

[mmcky]

thanks @AakashGfude can you document that in docs via PR. You may need to start a new page for conf options etc.

[AakashGfude]

Done in executablebooks/sphinx-tomyst#44

[mmcky]

Closing this as all contained issues are resolved. Will open individual issues.