Refactors the listing.html file and adds a heading to the page

[Murdock9803]

Fixes

• Fixes [Feature] Add proper documentation to listing.html and refactor for better structure #301 by @Murdock9803
• Fixes [Feature] Add a section heading to the resource cards #165 by @KrownWealth
• Related to [Feature] Organise code with proper indentation and comments #101 by @Xaid-vfx

Description

The pull request aims at enhancing the listing.html file by providing proper documentation, formatting the code and also a heading for the page.

Technical details

The PR performs the following tasks:

• Adds a heading to the page.
• Adds clear documentation about various sections in the file.
• Formats the code with prettier code formatter.

Screenshots

Heading:

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

Developer Certificate of Origin

For the purposes of this DCO, "license" is equivalent to "license or public domain dedication," and "open source license" is equivalent to "open content license or public domain dedication."

Developer Certificate of Origin

Developer Certificate of Origin
Version 1.1

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Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.


Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified
    it.

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.

[Murdock9803]

@possumbilities please have a look at the PR

[possumbilities]

Approved!