chore: purge obsolete .travis.yml and clean stale drf-yasg paths in staticfiles.json

- Remove legacy .travis.yml since continuous integration runs on GitHub Actions
- Remove 34 obsolete drf-yasg file mappings from static/staticfiles.json
- Recompute staticfiles manifest hash to match current static asset inventory

.travis.yml

@@ -1,17 +0,0 @@
----
-language: python
-python:
-  - "3.9"
-env:
-  - DJANGO=4.2.4
-install:
-  - pip install -r dev/requirements.txt
-script:
-  - pep8 --ignore=E501 vrtManager accounts admin appsettings \
-                                        computesconsole create datasource instances \
-                                        interfaceslogs networks nwfilters storages \
-                                        virtsecrets
-  - pyflakes vrtManager accounts admin appsettings computes console create datasource \
-             instances interfaces logs networks nwfilters storages virtsecrets
-  - python manage.py migrate
-  - python manage.py test --settings=webvirtcloud.settings-dev