Added allprojects.njk that lists all projecs (pagination), added contributing.md that has instructinos about adding your project to neoBeta, added errors template and 404 page, moved projects metadata to json file.

contribute.md

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+---
+layout: "base.njk"
+---
+## How can I get my project here?
+
+neoBeta is an open-source content management system. There are various ways you can put your plugin/mod on our catalog:
+ - Clone neoBeta's repository, create your project folder inside the /projects directory with the necessary metadata (index.md for project description, index.json for metadata and any other file your project may depend on) and make a pull request. Less manual work on our side, so review should be quickier.
+ - Open an issue on our GitHub repository with the project information. This may take longer as a contributor will have to spend time creating the project files, but is useful if you're not confortable using Git.
+ - Host your own instance of neoBeta.
+
+### Required metadata fields
+ - *name* - project name.  
+ ```"name": "Ghosts 'n Stuff"```
+ - *subtitle* - project's brief description.  
+ ```"subtitle": "Miscellaneous additions to your server."```
+ - *author* - your author name, must be consistent across all your submissions.  
+ ```"author": "tenkuma"```
+ - *tags* - whether your project is a plugin or mod.  
+ ```"tags": ["plugin", "mod"]```
+
+### Optional metadata fields
+Please fill as many fields as possible.
+ - *downloadLink* - link for when you click the download link.  
+ ```"downloadLink": "https://example.com"```
+ - *images* - lists of image files names or URLs that will appear in the project page.  
+ ```"images": "["image1.png", "image2.png", "image3.png"]"```
+ - *logo* - your logo file name or URL.  
+ ```"logo": "logo.png"```