Move `Package Repository` link to the top menu

[saenai255]

Currently there are 5 navigation links in the top menu. Adding more would take too much space and might get overwelming.

How the navbar currently looks

├─ Pacstall
├─ Download/
    ├─ How to Install
    ├─ Package Repository
├─ Showcase
├─ Social Networks/
    ├─ Discord
    ├─ Matrix
├─ Packages

My Proposal

├─ Pacstall                            # Showcase embedded in homepage
├─ How to Install                      # Link to Github How to Install section
├─ Social Networks/
    ├─ Discord
    ├─ Matrix
├─ Contribute/                                                   
    ├─ Work on new Features            # Link to Pacstall Github
    ├─ Become a Package Maintainer     # Link to Pacstall Programs Github
├─ Browse Packages

[wizard-28]

My suggestion:

├─ Pacstall                            # Showcase embedded in homepage
├─ Install                             # Link to Github How to Install section
├─ Contribute/                                                   
    ├─ Work on new Features            # Link to Pacstall Github
    ├─ Become a Package Maintainer     # Link to Pacstall Programs Github
├─ Browse Packages

And a footer housing the Social Networks