Improve responsiveness of pages

[jwgmeligmeyling]

Some tables aren't as responsive as could be

• Build servers overview: https://devhub.ewi.tudelft.nl/build-servers
• Table on assignment overview for groups: https://devhub.ewi.tudelft.nl/courses/TI1706/groups/1/assignments
• Contributors overview for groups https://devhub.ewi.tudelft.nl/courses/TI1706/groups/1/contributors

Not sure how to fix this elegantly, but we could try:

table {
  border: none;
}

table,
tr,
td,
tbody,
thead,
th {
  display: block;
}