Update README to mention Django, and capitalise external project names

[mthaddon]

Applicable spec: N/A

Overview

A trivial README update to mention Django, and capitalise external project names.

Rationale

To improve the README.

Juju Events Changes

N/A

Module Changes

N/A

Library Changes

N/A

Checklist

• [x] The charm style guide was applied
• [x] The contributing guide was applied
• [x] The changes are compliant with ISD054 - Managing Charm Complexity
• [x] The documentation is generated using src-docs
• [x] The PR is tagged with appropriate label (urgent, trivial, complex)

[github-actions[bot]]

Test coverage for 9b04ccf26f8da8ae2ca46003fbdef264532e94a1

Name                                           Stmts   Miss Branch BrPart  Cover   Missing
------------------------------------------------------------------------------------------
paas_app_charmer/__init__.py                       1      0      0      0   100%
paas_app_charmer/_gunicorn/__init__.py             0      0      0      0   100%
paas_app_charmer/_gunicorn/charm.py              116     29     18      6    72%   60-62, 147-148, 150-151, 171->exit, 181-185, 190, 196-201, 205-206, 210, 214, 218, 222, 226, 230, 234, 238, 242, 246
paas_app_charmer/_gunicorn/charm_state.py         63      1      6      1    97%   194
paas_app_charmer/_gunicorn/observability.py       20      0      0      0   100%
paas_app_charmer/_gunicorn/secret_storage.py      14      1      0      0    93%   39
paas_app_charmer/_gunicorn/webserver.py           76      5     16      2    92%   19, 155, 167-173
paas_app_charmer/_gunicorn/wsgi_app.py            60      1     22      1    98%   80
paas_app_charmer/database_migration.py            34      0      2      0   100%
paas_app_charmer/databases.py                     38      3     13      2    90%   82, 97-98
paas_app_charmer/django/__init__.py                2      0      0      0   100%
paas_app_charmer/django/charm.py                  45     13     10      0    65%   72-77, 89, 97-114
paas_app_charmer/exceptions.py                     5      0      0      0   100%
paas_app_charmer/flask/__init__.py                 2      0      0      0   100%
paas_app_charmer/flask/charm.py                   37      0      6      0   100%
paas_app_charmer/helpers.py                        9      0      2      1    91%   18->20
paas_app_charmer/secret_storage.py                40      6     16      4    79%   50, 54->53, 55->57, 85, 103-108
------------------------------------------------------------------------------------------
TOTAL                                            562     59    111     17    87%

Static code analysis report

Run started:2024-04-10 16:24:31.047976

Test results:
    No issues identified.

Code scanned:
    Total lines of code: 1240
    Total lines skipped (#nosec): 0
    Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
    Total issues (by severity):
        Undefined: 0
        Low: 0
        Medium: 0
        High: 0
    Total issues (by confidence):
        Undefined: 0
        Low: 0
        Medium: 0
        High: 0
Files skipped (0):