feat: Handle submodule

Submodules tree entries won't have a broken link and will be labeled
properly.

feat: Add diff view

Adds a very simple diff view for a commit

doc: Add one idea

feat: Add tar.gz link to commit page

feat: Add anchor to line number

ref: Remove space waste from pre margin

chore: Update todo

feat: Sort tags

ref: Simplify path builder code

feat: Add user-agent to logs

feat: Add pathing to the tree tab

chore: Update readme and add LICENSE

ref: Align navbars

feat: Add commit page

ref: Redo commit cell

ref: Reorder sub header

ref: User correct err naming

fix: Handle about file not found

fix: Ignore tar files when compressing

ref: Move binary handling up to the handler

Now it is up to the handler to decide whether it wants to render a file
or not, git only returns the content.