Fix html assets

[villanella]

589 and #327 fixes

Details: For fixing #589 I wanted to copy template dir to output assets dir as a part of get_template function and it worked fine in manual tests, but this change broke some tests, so I decided to duplicate template dir as assets dir in doorstop/core/files instead of code changing. Maybe the variant from my first commit would be better, but it requires update of tests.

For fixing #327 (overlapping text by sidebar) I used the idea from this unmerged PR - https://github.com/doorstop-dev/doorstop/pull/353/files, I added 2 params in sidebar.css:

    width: 18em;
    overflow: hidden;

[codecov-commenter]

Codecov Report

Merging #612 (8dd5aad) into develop (e91dc8f) will decrease coverage by 0.03%. The diff coverage is n/a.

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@@             Coverage Diff             @@
##           develop     #612      +/-   ##
===========================================
- Coverage    94.95%   94.93%   -0.03%     
===========================================
  Files           36       36              
  Lines         4853     4853              
  Branches       930      930              
===========================================
- Hits          4608     4607       -1     
- Misses         148      149       +1     
  Partials        97       97              

see 1 file with indirect coverage changes

[jacebrowning]

Maybe the variant from my first commit would be better, but it requires update of tests.

I think that would be preferable to duplicating the asset files.

[villanella]

Maybe the variant from my first commit would be better, but it requires update of tests.

I think that would be preferable to duplicating the asset files.

@jacebrowning Thank you for your response, in my PR this is done.

[neerdoc]

I think we can close this. #589 is fixed already, and I have a PR soon that fixes #327 as well. I just have to add a few more test cases.