LibreJS: Fix Table Formatting

This commit makes the LibreJS table utilize the bootstrap styles
make the table not look absurdly ugly. It also adds table headers,
which is nice 👌.

In the future, it might be neat to add a test case which loads the
LibreJS parse engine to check for licenses that are not added to the
table. Is there a way to load the IceCat addin in some kind of
headless firefox?

Signed-off-by: Mark Stenglein <mark@stengle.in>
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