Add missing 'Normal' style

[AudunWA]

This fixes privateOmega/html-to-docx#180, where Heading styles "bleeds" over to normal text in paragraphs below, when viewed in macOS Pages.

The problem seems to be that all other defined styles are based on "Normal" (see w:basedOn in the same file), which didn't exist. Other docx viewers seems to handle this issue, but Pages renders it incorrectly.

[nicolasiscoding]

@AudunWA thank you for this! I will assign a team member to QA this

[nicolasiscoding]

@AudunWA On another note, is there a way to simulate this across our 3 different testing files we have to prevent regressions?

For example this file (and the other two)?
https://github.com/TurboDocx/html-to-docx/blob/main/example/example-node.js

[AudunWA]

@AudunWA On another note, is there a way to simulate this across our 3 different testing files we have to prevent regressions?

For example this file (and the other two)? https://github.com/TurboDocx/html-to-docx/blob/main/example/example-node.js

Thanks for taking a look at the PR. I'm not sure what you want me to do with the test files – there isn't supposed to be any changes in the input HTML. You could run the testing files in my branch and see that the output docx is changed, and from there open the generated files in Word/other editors to check for regressions.

[nicolasiscoding]

@AudunWA - good point, will need to test this against the flavors of Msft office, libre, google docs, pages etc

[nicolasiscoding]

@AudunWA

Tested on Libreoffice, Microsoft Office for the Desktop, Google Doc, Microsoft365/Word for the Web