browse: Fix a couple of spotted issues in the UI

Ensure only source code is highlighted in content views

---

Fix breadcrumb link for root directory in revision view.

---

Rework "Download" button in content views to offer the same feature as the "Raw File" one except the content will be downloaded and saved to disk instead of rendering it in the browser.

Fixes #4834 (closed).

Jenkins job DWAPPS/gitlab-builds #1603 succeeded in 8 min 41 sec.
See Console Output, Blue Ocean and Coverage Report for more details.

added 5 commits

• 56800c09...8aab111d - 2 commits from branch swh/devel:master
• 4b329024 - browse: Ensure only source code is highlighted in content views
• 49c73e7f - browse/revision: Fix a couple of issues in the UI
• 5ec5cab3 - browse: Add Download button to content views

Compare with previous version

Jenkins job DWAPPS/gitlab-builds #1612 succeeded in 11 min.
See Console Output, Blue Ocean and Coverage Report for more details.

merged