Added support for anchors on sidebar

[marcosvega91]

Motivation

Hi, i like this project and so I have decided to improve the docusaurus functionality implementing the one suggested by @JoelMarcey.

Test Plan

I haven't completed the feature yet. It works now but I have to add support for i18n and add some styles.
I have added an option key for each category into the sidebar.json called anchors. This key is an array of anchors. The anchors are saved as metadata inside metadata.js and then they will be rendered into sidebar as an ul list inside category (image below) .

Related PRs

[JoelMarcey]

@marcosvega91 Thank you very much for this pull request. I need to get a release out with some bug fixes, but I will review this right afterwards.

[marcosvega91]

Hi @JoelMarcey thanks for your time. Today I have fixed a bug that caused the failing of tests. Now I would improve my code

[JoelMarcey]

@marcosvega91 Hi! Did you want me to review this PR as it is? Or were you planning any other changes/improvements?

[marcosvega91]

Hi @JoelMarcey I would like to add the support for translation for the anchors, but in these days I didn't have so much time

[microbouji]

Hi @marcosvega91! If you're still interested in working on this we now have autogenerated anchors from the document headings. Check out #474 and #475. You can use the OnPageNav component to display the list of anchors under the currently active list item when the new siteConfig.js option onPageNav is set to 'embed'.

[JoelMarcey]

Hi @marcosvega91 @microbouji - Just to be clear - embed doesn't currently exist - it would have to be created as the option represented by this PR in combination with what @microbouji did.

[yangshun]

@marcosvega91 How is it going with the planned changes/improvements? Let us know how you can help! If you have less time these days to work on it, it's totally ok, just let us know and we can take it from here.

[yangshun]

Closing due to inactivity. Feel free to reopen.